Quote Originally Posted by yok-dfa
AFAIK it's not a prototype. It was sold in shops (or shop? i don't know) and for a limited time only... I guess yours is loose too? Also where did you get it? So far, i've only been able to track down 4 (5 including yours) copies. Marco has one, there's a picture of one on the gamereset.de website, but i don't know who currently owns that copy, and i have 2 of them ( ).
What I have is definitely a prototype. It's in the traditional black case with the Atari typed label on it saying "Pengo (PAL)". Like most prototypes you see.

I don't know if Marco has a proper picture labelled version, but I got the proto from him last year. Only cost me $150 which is rather why I took it (as I knew any PAL version of it was very hard to find).