If you’re into coin collecting or just like checking your pocket change, here’s one penny you don’t want to miss—the RPM (S over S Mint Mark) Wheat Penny, which has sold for up to $32,900. It may look like an ordinary coin, but a small minting error makes it a big deal in the world of rare coins.
Let’s break down what makes this penny so valuable and how you can spot one.
What Is an RPM (Repunched Mint Mark)?
RPM stands for Repunched Mint Mark. It happens when the mint mark on a coin—like “S” for San Francisco—is punched into the coin more than once but not in exactly the same spot. This mistake creates a visible double or shadow-like image of the letter.
For the S over S (S/S) mint mark on a Lincoln Wheat Penny, it means the “S” was punched twice, and you can clearly see the extra impression if you look closely with a magnifying glass.
Which RPM Penny Is Worth $32,900?
The most valuable example of this error is the 1955-S Lincoln Wheat Penny with an S/S RPM. One of these coins, in top condition and with strong repunching, sold at auction for $32,900. The value can vary depending on the condition and how visible the minting error is.
Even lower-grade versions of this coin can still be worth hundreds or thousands of dollars if the RPM is clear.
How to Spot an S/S RPM Wheat Penny
To check if you have an RPM penny:
Look for:
- A wheat penny dated 1955, 1946, or 1949, especially with an S mint mark (just below the year)
- A double “S” or shadow around the “S”
- Use a magnifying glass or coin microscope to inspect closely
If you find something that looks unusual, it might be worth getting it professionally checked.
Why Are These Coins Valuable?
RPM coins are rare minting errors. Since they weren’t meant to be made this way, only a limited number exist. Collectors love these unique pieces, especially when they are in excellent condition with clear errors.
The RPM S/S Lincoln Wheat Penny is a great example of how small details can make a big difference. A regular penny is worth just one cent—but this one could be worth up to $32,900 if it has that repunched mint mark.
If you enjoy coin collecting or even just sorting through spare change, keep an eye out for minting errors. You never know when you might come across a tiny treasure hiding in plain sight.
FAQ’s
What does RPM mean in coin collecting?
RPM stands for Repunched Mint Mark. It refers to a minting error where the mint mark is stamped more than once in slightly different spots, creating a shadow or doubled effect.
Which RPM Wheat Penny is worth $32,900?
The 1955-S Lincoln Wheat Penny with a clear S over S (S/S) repunched mint mark is one of the most valuable RPM coins, selling for as much as $32,900 at auction.
How can I tell if my penny has an S/S RPM error?
Look closely at the ‘S’ mint mark on pennies from the 1940s and 1950s. If you see a doubled or shadow-like ‘S’, it could be an S/S RPM. Use a magnifying glass to check.
Are all RPM coins valuable?
Not all RPM coins are extremely valuable, but many can still fetch high prices, especially in excellent condition. The clearer and more dramatic the error, the more valuable it tends to be.
Should I get my coin appraised if I suspect it’s an RPM?
Yes. If you think your coin has an RPM error, especially one with an S over S mint mark, it’s best to have it checked by a professional coin grading service or appraiser.
