Coin Diameter
The diameter of each coin was measured with dial calipers calibrated to one hundredth of a millimeter. The use of a dial with a needle made reading easy.
All coin diameters are measured in the metric system, i.e. millimeters. I can hear you groaning already. You are trying to remember that 1 inch equals 25.4 mm, and how to do the conversion. Forget it. Forget all of it. Let's make it simple for you.
5mm smaller than the coin diameter is fine). Placing a coin in the air tite coin holder is simple. Just open the capsule and (while wearing cotton gloves of course) push the coin gently into the inner ring so that it sits flat and square.
Coin diameter 22-23 mm.
/GENIO CAESARIS, Genius standing holding patera and Victory crowning emperor
/ALE, K to left, A over P to right.
If the obverse was as above, the impressed coin was RIC VI, Alexandria 100aA, page 678, of late 308-310.
However, as can be seen in the photo at the right, it is possible to compare two coins and detect a difference in diameters. Look at the top of the photo and you will see a very definite difference in coin diameters.
 See also: Coin, Mint, Regular, Slight, Revers
  
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