Hidden Dates on German Cartridge Cases

[jeff w]

I've got an 88 case (6347) with what appears to be a 'K' date. Wondering if anyone can confirm this.
When Hitler started violating the Versailles Treaty he tried to cover his tracks by replacing the dates on ordnance with letters ('K' = 1934 and I believe 'G' was 1935). By 1936 he was no longer hiding ordnance production.
I've seen it on lugers. I'm guessing he was doing this on cartridge cases as well.
Does anyone else have any 1934 - 1935 dated or lettered German cartridge cases?

 

[Alpini]

You are right with both letters and such cases are quite common to find. Also fuzes and other material.