Gamma Company Sleeves

Gamma sleeves are either the red paper sleeves or the blue, white, transparent plastic sleeve. Gamma changed address from Ejército Nacional 167 to Emerson 432 in 1976, according to Discogs. So, with this information, the red paper sleeves should go with pre-1976 singles and the plastic sleeve should go with post-1976 singles. I believe the “Paper Sleeve (early)” is the first since it has a shorter phone number than the one I call “Paper Sleeve (late)”

I think this is the first of the two paper sleeves since it has a shorter phone number. At the moment, it is impossible to determine when they changed the sleeve design.

Company Sleeve: ZappaFrenzy (Bjørn)

My guess is that this is the later paper sleeve since it has a longer phone number than the sleeve presented above. I can not tell when this was in use.

Company Sleeve: RJ

This is a plastic sleeve and the address is changed to Emerson 432. Gamma changed address in 1976 according to Discogs, so I assume this was used from 1976 to 1979.

Company Sleeve: ZappaFrenzy (Bjørn)

References 


Gamma at Discogs