(Image better seen at the largest size). The Rolleiflex SL 35M has some relationship with one of the lasts Zeiss Ikon cameras, the SL 706. The 35M and the identical Voigtländer VSL 1 BM have the QBM bayonet. The camera has self-timer, TTL Cds coupled lightmeter, DOF preview, double diagonal split image in the vewfinder, hot shoe and PC terminal for flash, shutter cable release, mechanical shutter with focal plane fabric curtain (B,1/2sec to 1/1000sec), it was made by Rollei Singapore from 1976 to 1979 and sold in the black version only.
Note: My blog about the Rolleiflex SL 35 System: http://rolleiflexsl35system.blogspot.com/2011/06/rolleiflex-sl-35-system.html