[Edward Tinker]

No, those are normal luger numbers. Depending on the year, but lets take military WW1 as this discussion; every year the numbering started over, so they were marked 1,2, 3, 4 up to 9999 then supposdely 10,000 and then started over, 1a, 2a, 3a, up to 9999a, then 10000a, then 1b, 2b, 3b, up to 9999b, etc. Some years there were 180,000 lugers made, so you can see that many letters of the alphabet were used for suffixes.

However, suffixes were never stamped on the side of the receiver (or are so rare that it does not matter in this discussion).

And since you said the stock lug is not there (although it may have been expertely removed), the frame is 202, could be a really old one, or it could be with the suffix gone. Pictures are needed to see what kind of frame it is; ones without the grips on them.

The receiver is numbered correct and could be from many, many different years; if a WW1 piece, from 1914, 1915, 1916, 1917 or 1918 (I may be off on a year there, but you see the example).

Ed

BTW, there are either 5 digit serial numbers or 4 digit (or less) with or without a suffix; there are no serial numbers with a letter in between... ref 34F5