It is less than I would have thought also. However, this depicts 2.5% of a pie chart. After seeing this, I might concur with a 2% value on the...
If the outer surface of a coin contains silver, then it may reflect visible light better than a similar surface which does not contain silver....
The tissue paper test will show you visually whether a coin contains significant silver. See these previous CT threads:...
The Web link performs the math & it looks great! When you calculate the area of the segment [the segment is the green area in the diagram #2],...
I've got one of his coins: [ATTACH]
This link describes the math for determining the area of a circle bisected by a chord (straight clip)....
The guys were characters on TV. "Happy Days" was an American television sitcom that originally aired from 1974 to 1984. It has some spin-off TV...
It was purchased in the slab so I don't know the weight or dimensions of the 1971. I've never examined the coin outside of the PCGS slab.
Hello JA, I'd like to know more about this "IBSCC Bulletin on Counterfeits". Is an available/affordable book or is it available on the Internet...
This thread provides a wonderful discussion and analysis of the slab vs raw ancient coin conundrum. Thanks for giving all at CT a good read. :)...
Thank you. OK so Perseus was preceded by Philip V. His (Perseus) reign was 179–168 BC according to Wiki. I was trying to get a date-range for...
This is a small rocket engine from the Apollo project. Rockets of this type controlled the position of the command module. [ATTACH]
Cool medals folks. The following two Apollo flight awareness medals have been posted in previous CT threads. These two medals include some...
There are some good coins posted in this thread. We have 10-cent, 25-cent, 50-cent, and dollar coins. Here are Ike dollars dated 1971, 1972, &...
Good photos & information in this thread. Coincidentally, I photographed this coin last night: [ATTACH] This coin was returned to the SDB at...
Am I correct that your Perseus coin would have been minted sometime between 212-160 B.C.? I think that is about right because Perseus was son of...
Always nice to see your coins Zohar. These latest examples are really attractive. I bought these two because I could read everything on the...
[ATTACH] Nice state quarter Zachkeaton ! Here is a Georgia quarter with the reverse missing clad layer: [ATTACH]
I've got a fair number that are raw: [ATTACH][ATTACH][ATTACH][ATTACH]
Nice example of a missing partial clad layer before strike! I have this one where the partial clad is missing after the strike. (It was...
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