Inspecting a Used Antique Slot Machine Before You Buy: A Collector's Checklist
Buying a used antique slot machine is mostly an exercise in noticing things. The machine in front of you has probably been repaired before, possibly more than once, and some of those repairs were done well while others weren't. Your job is to see what you're actually buying before you pay for what the listing says it is.
This checklist is built for an in-person look or a detailed photo and video review. It works whether the machine is from an estate, a collector, a dealer, or an online listing. It assumes you've already confirmed that owning one is lawful where you live. If you haven't, start there.
Before you go: questions to ask the seller
Most bad purchases can be avoided with a few direct questions asked in writing. Write the answers down and compare them to what you see.
- What maker and model do you believe this is, and why?
- Is there a serial number? Can you send a clear photo of it?
- Does it work? Will you demonstrate it with coins or tokens while I watch or on video?
- What has been restored, replaced or repainted, and by whom?
- Are the keys included for every lock?
- Is the mechanism original to this cabinet, as far as you know?
- Is there any paperwork, ownership history or previous sale records?
- How will it be packed and moved, and who pays for it?
Vague answers aren't automatically disqualifying. Plenty of estate sellers honestly don't know. But a seller who claims certainty about originality and then can't show the mechanism is a different story.
Step 1: Confirm what the machine actually is
Start with the big picture. Does the case style match the maker the seller named? Is the coin denomination plate consistent with the rest of the machine? Do the casting details, the reel window layout, and the jackpot area match published examples of that model?
Use reference books and maker pages to check details. The site's home page links to maker guides for Mills, Jennings, Watling, Pace, Caille and others. If you're new to a maker, spend time looking at a lot of listings first, such as Watling slot machines on eBay, so you develop an eye for the correct shapes.
Two common traps: full reproductions sold as originals, and “marriages,” where an original mechanism sits in a reproduction case or parts from different machines are combined. Neither is wrong to own if it's disclosed. It's a problem when it's priced and described as all-original.
Step 2: Cabinet, castings and finish
The exterior tells you about restoration history. Look for these things:
| Area | What a good sign looks like | What should make you ask more questions |
|---|---|---|
| Front castings | Crisp detail, consistent wear on high points, fit tight to the case | Soft or blurry detail (a sign of recasting), gaps, mismatched finish between castings |
| Wood case | Consistent age, old screw holes that line up, joinery that matches the era | Fresh wood inside, new plywood panels, filled holes in odd places |
| Paint and plating | Honest wear, or a disclosed and well-done restoration | Thick paint over pitting, bright new plating described as “original” |
| Pot metal parts | Solid, no crumbling, no swelling | Cracks, flaking, powdery white corrosion, or epoxy repairs |
| Glass and windows | Clean, intact, correct fit | Cracks, plastic replacements where glass belongs |
Restored doesn't mean bad. Many collectors want a restored machine. The issue is whether the description matches reality.
Step 3: The mechanism
This is where most of the risk lives. Ask the seller to open the back door and, ideally, to pull the mechanism so you can look at it. Things to check:
- Reels spin freely and stop cleanly, without dragging or rubbing.
- Handle pull feels smooth and returns fully.
- The timing or clock mechanism (if the machine has one) runs evenly. An uneven or stuck clock is a common source of trouble.
- No broken, bent or welded parts. Look closely for brazing or epoxy on levers and frames.
- Springs look appropriate rather than mismatched hardware-store substitutes.
- Reel strips are aligned and readable. Note whether they look original or reproduction.
- Payout slide or payout mechanism works and coin tubes are in place.
- Serial numbers on the mechanism and case, if both exist, are consistent with each other.
Grease and dirt are normal. Excessive fresh oil sprayed everywhere can sometimes hide wear, and it also attracts dust. A dry, clean mechanism is often a better sign than a dripping one.
Step 4: The coin path
Run several coins or tokens through the machine if you can. Watch for jams in the coin entry, coins that fail to register, and coins that drop straight through. A machine that “just needs a little adjustment” can need anything from a cleaning to a hard-to-find part.
Check whether the coin entry is set up for the denomination on the front plate. Machines are sometimes converted between denominations or to tokens, and that's useful to know both for value and for legal research.
Step 5: Locks and keys
Most machines have more than one lock, typically one for the back door and one for the cash or coin box. Confirm the keys work in every lock, and that the locks turn smoothly. Missing keys aren't fatal, but they add cost and sometimes require a locksmith. Drilled or replaced locks are worth noting for originality.
Step 6: Paperwork and history
Ask for anything the seller has: receipts, restoration notes, previous auction listings, photos from before restoration. Ownership history doesn't make a machine original, but it can support claims about age, which may matter for legal research in your state.
Step 7: Research value yourself
We don't publish values, and you shouldn't rely on the asking price either. Before you negotiate, look at completed sales of the same maker and model in similar condition. Start with sold Mills slot machine listings and sold Jennings listings, and read the descriptions carefully. Two machines with the same name can differ hugely in originality, completeness and condition.
Our post on researching old arcade machine sold prices walks through how to read sold data honestly, including why a single high sale isn't a market.
What to bring to an in-person inspection
Bright flashlight
For inside the case and the mechanism. A headlamp keeps your hands free.
Loupe or magnifier
For castings, serial numbers and repairs.
Coins or tokens
Enough to run a real test, in the right denomination.
Phone camera
Photograph everything, especially serial numbers and the mechanism.
If you don't own a decent loupe, browse 10x jeweler's loupes on Amazon. It's useful for this hobby and plenty of others.
When you're comfortable, compare the machine against a wide range of current listings like original antique slot machines on eBay so you can tell what's typical for the type.
Frequently asked questions
Should I buy an antique slot machine without seeing it work?
You can, but price that risk in. A non-working machine may need anything from cleaning to rare parts. If the seller can't demonstrate it, treat it as a project and research parts availability first.
How can I tell if a slot machine is a reproduction?
Compare castings, case construction, reel strips and hardware with reference books and well-documented examples. Soft casting detail, modern fasteners and new wood are common clues. For an expensive machine, get an experienced collector or restorer to look at it.
Is a restored machine a bad buy?
No. Many collectors prefer restored machines. What matters is that the restoration is disclosed, done with correct parts, and priced accordingly compared with original-finish examples.
What if the keys are missing?
Missing keys are common. A locksmith can often open and key the locks, but drilling damages originality. Factor the cost and hassle into your offer.
Walk away more often than you buy
The best inspection habit is a willingness to walk away. There are always more machines. A slow, careful look at the cabinet, the mechanism, the coin path and the locks, plus your own research into comparable sales, will save you from most expensive mistakes. Take photos of everything, ask questions in writing, and buy the machine you actually saw rather than the one the listing promised.
More collector research lives on the CoinSlots.co blog.