The only thing that makes any sense is that this is a unit of weight.
Searching google I found: dwt is the standard abbreviation for pennyweight. Pennyweight is 24 grains, 1/240th of a troy pound, 1/20th of a troy ounce. Jewellers use pennyweight in calculating precious medals.
R.I.P. Wayne, Brad Collecting: Conder tokens 19th & 20th Century coins from Great Britain and the Realm
Correct DWT or dwt = pennyweight. a unit of mass which is the same as 24 grains, 1/240th of a troy pound, 1/20th of a troy ounce, approximately 0.055 ounces or approximately 1.555 grams.
Comments
Searching google I found:
dwt is the standard abbreviation for pennyweight. Pennyweight is 24 grains, 1/240th of a troy pound, 1/20th of a troy ounce. Jewellers use pennyweight in calculating precious medals.
Collecting:
Conder tokens
19th & 20th Century coins from Great Britain and the Realm
DWT is an abbreviation for pennyweight. There is 20 DWT in one ounce.
For him/her to mark 3 DWT, he believes it is .15oz, but in reality, it would be 4.854 DWT
... I think
"You Suck Award" - February, 2015
Discoverer of 1919 Mercury Dime DDO - FS-101