10A61 as shown by Sevesteen's original post would lead one to belive it means the 10th day of August in 1961. However not all of the stamped codes seem to use the same "logic". Sometimes it seems that the "Alphs" are more like the U. S auto manufacturers, and represent the year very much like the method Enland uses to "Hallmark" gold and silver.I would again appeal to "Fred Olsen" to be more forthcoming with information if he has it. If he intends for this to be a "Deepthroat" type of search for the answers, I not sure it will work.