Quentin, the Mauser Military Lugers had a different numbering system than the DWM Lugers. The first Mauser Luger was completed in 1934 and was designated 1. After that they went to 9999, the next number was 1a and completed that years production around 920a. They went on to the 1935 production starting at number (about) 921a and continued to 9999a. then 1b to 9999b and so on. They didn't start the numbers at 1 for each new year, they just continued the numbering sequence.
Next, unlike DWM, Mauser didn't add the letter suffix to the barrel. The only place the suffix appears is on the front of the frame!
Hope this helps!
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