What markings did the germans used to signify kills

[Skuzzy]

And what did Finns use on their Brewsters?

Beer bottle labels, of course 


(Image removed from quote.)

Well ok, just one of them did

Does that represent how many kegs he killed or individual steins?

[BlauK]

Just plain plane kills
He was not known to spit in the glass though, quite the opposite. Those markings cover his kills in Fokker XXI:s and Brewsters. After those he became the CO of Lentolaivue 34 and scored some 39 more kills in 109G:s, becoming the third highest ranking ace in FAF.

http://koti.welho.com/skukkone/LLv34/2cohist.htm
http://www.sci.fi/~fta/finace03.htm

[saantana]

Hes nearly as good as me. 

[Bubbajj]

That Finn Pilot looks like Fred Gwynne!!