I have a Canadian 1999 December 25 cent coin that has no ridges on it's edge. First suspected someone ground off the edge but coin still weighs mint specs of 5.05g on jewlers scale. Diameter and thickness specs are off though. Mint specs are 23.88mm diameter and 1.6mm thick. This coin is 23.66mm diameter and 1.92mm thick, so edge has been squashed. It appears that this may of been done during mint because there are no clamp marks, no warpage or distortion to shape or stamping, only dimension change and missing ridges. Anyone know anything about this or is this just something someone did to it? Hahaha ........ Sent an email off to the Royal Canadian Mint inquiring about this and just received their reply today. They say they can not determine the value of my coin without me sending it into them. They also say that if it is an error coin they will replace it with a coin of equal denomination ....... YEAH RIGHT! lol Hope someone here can help
Gunner3oo6,you should email the Royal Canadian Mint again,but this time,attach photos of the coin.I don't blame you for not wanting to sell your 1999 25c. coin back to the mint.Why should you?
I have not heard of any other coins like you have but even with the best Quality Control Standards mistakes will still happen. It could be just a regular planchet that did not get reeded for some reason.
If it is a full strike, then it has been messed with, as the other poster said. How did you measure thickness? At the rim? If so, then I would guess the rim is a bit higher than normal. Sounds like it was tapped down. Too small and too thick and a normal strike would really suggest to me an altered coin. If it was struck outside of the collar, that would look different. If it did not reach the reeded collar, then it would likely not have been a full strike. Just my opinions.
pics of the coin I'll try to attach pics I've taken of it and an identical coin that has the ridges. If pic is too small then larger one is at http://us.f1f.yahoofs.com/bc/266e1d18/bc/coin/coin.bmp?bf0bVACBc.RpEqwm . Measurement was taken at the rim. I figured that the coins edge was rolled and not ground down because the weight is ok, the coin isn't lighter than it should be. The edge is very even and level, no sections lower or flatter. I would think this would be real hard to do by hand. My thoughts were that maybe the equipment used in minting was dammaged or something, but this is just a guess because I don't know the exact process. Sorry, the pics are the best my camera will do. Thanks, for the help.
From what I know about the minting process, an „error“ such as thins would be pretty much impossible. If there were no collar, the coin would be larger than normal. If there was a collar in place, the coin would be the proper size, with reeding, I can not imagine a scenario where a fully struck coin with a proper rim (or a little high) would be undersized. My guess is someone was experimenting with tools (maybe some sort of roller or sizer for something.) Could have been rolled between two cylinders. Not sure where you would get a contraption like that, but it would result in this exact thing.
