What's The Weight Tolerance For A 2 Cent Piece? (1864 In Question)

That makes sense. I've never collected any thin planchets so I wouldn't know my weights well and how much a coin could lose during circulation.

Thanks, BH and Coinfrog.

I do believe it's 4.7 grams. I tested some other coins in the scale and it seems to be in calibration. I thought that seemed like a lot even with the wear, but crazier things happen to coins.

Any US coin with this much weight loss from wear would be completely detail-free on both sides. No way this coin started out as a normal, full-weight mint product. Throwing out two random, unlikely explanations:
1) contemporary counterfeit.
2) off-metal strike on a less-dense alloy.

I realized coming back to this post today that I never uploaded the scale photo:

This coin isn't a counterfeit, it's just worn. It is most likely die pairing FL-13CA fairly obvious as the 6 is so close to the ball of the shield bottom and the 4 even higher than the 6. Possibly FL-79BH also a very similar date placement. The amount of wear this coin has makes it virtually impossible to tell 100%, I might be able to in hand but not from photographs, there a few subtle die cracks that may still show up faintly that could designate one die pairing from another, but it doesn't really matter as neither are super rare.

Is there any rotation of the obverse to reverse? The FL-13CA is fairly well known to have varying degrees of rotation on it. Also known to have a mushy reverse and incomplete rim especially around the TE of states, Areas this coins is exhibiting weakness and wear already.

There are next to no known off metal strikes (excepting patterns) in Two Cent series, and major errors are extremely rare, for the amount struck (especially in 1864 & 1865) there just aren't many errors found to this day. I can count only a handful of off center, double struck examples, (way less than 30 found) and even less capped, brokage, and flip over strike examples, however, there are quite a few known thin planchet examples which this is much more likely.

I have also not seen counterfeits from the era. Only modern fakes out of China, surprising again as you see 3 cent silver counterfeits often, though that is likely due to the silver base metal versus copper/bronze alloy.

Here is a little blurb from noted Two Cent author and expert Frank Leone from his short lived "2-Cent Times" newsletter. (I have almost 2 complete sets of this really rare newsletter), and I have spent time at the ANA researching this unlike Frank, and still have not uncovered much more than he has from the article. 2 Cent errors are really, really rare (at least the major ones are). Lots of Cuds, interesting die cracks, RPDs, a few DDOs, 1-DDR, and many other minor die varieties.

I also didn't know counterfeits would be rare/non existant. I was just applying my retail knowledge about modern counterfeit patterns. That's why I get for assuming!