BYF 42 S/N Question
 

I just picked up an all matching BYF 42 with a 3 digit serial number 219. My script reading is not great but I think that the suffix is an L. I haven't found a 3 digit number before so does this make it less common or was it normal for the BYF 42s?

It's common. They don't start the serial number with a 0, so 100 to 999 in each suffix will be 3 digits.

Another way of stating it would be: 10% of each suffix run would have three digits, 1% would have two digits, and .1% would have one digit.

808n!!! Thats near the end of the line for the byf 42s. I
believe I saw somewhere that 3061n was the last one...

All Mauser Lugers are numbered 1 through 9999 and then followed with 1 - 9999a followed by 1 - 9999b, 1- 9999c, 1- 9999d, etc. This included about four time through the alphabet.
For example the 1934 K-dates were no suffix 1 - 10,000 than 1a to about 1200a. the 1935 G-dates started here and went througn 9999a to 1b through 9999b 1c through
9999c, etc. Check out the serial number and suffix ranges, it's a great learning experience. Anyway this numbering and letter suffix continued until 1942. This included the 1936, 1937, 1938. 1939. 1940, 41 and 42 Lugers. As you can see there was a lot of 1, 2, and three digit nunmbers. There is always the exception. A few were numbered to 10,000 before they started over. I have seen K-date number 10,000.