[eknutson]

I think we now have information to solve it:

F2: stkz block for werknr 6667 - 6692 give GC+FA - GC+FZ, meaning werknr 6677 = GC + FK ( K on underside off main spare)
werknr 6679 = GC + FM ( 6651 + 28 u side off m spare)

We then need info on 6677 and 6679 to deside the letter K

G2 / G4
If we think the same vay here MA are stkz and 234 are numer in the werk nr block

WNF have a werknr block range from 14501 - 14850 14501 + 234 = 14735

Alpabete have 26 letters MA are then 13 x 26 = 338 littlebit higer
vill give a werk nr 14839

I found this macine A G2 from WNF NV + MA werk nr 14847 i think will corespond well with the stkz

We need info on werk nr 14847 and 14735

Ernst