Marzio, yes it can be somewhat confusing. The byf 41 Lugers started in the N-Block, then went to the O-Block and so on until the Z-Block. Mauser then started over with the No Suffix (NS)-Block, the A-Block and just into the B-Block. So the no suffix is, in reality, toward the end of the production.
The double E/135 Acceptance Marks first appeared around 1000 NS, so yours would be an early example. Estimates of about 4000 double E/135 and mixed E/655, E/135, combined, were produced between 1000 NS and 1000b. The remaining in that range are the double E/655 and byf 42. The majority of the 4000 are double E/135.
Congratulations!!!
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