They don't make them like this anymore

From right to left:

SR-1 (1959-71) Instant return mirror! Automatic stop down of aperture at exposure! External selenium meter.

SR-3 (1960-62) Flagship model. Semi-automatic exposure control! Automatic diaphragm!

SR-7 (1962-1966) First SLR with built-in CdS light meter!

SR-T101 (1966-75) First SLR with TTL metering at full aperture! First SLR with matrix metering!

SR-T303 (1973-75) Full information viewfinder! Split-image rangefinder!

 

photo made with: NEX-5 + Voigtlander Apo Lanthar 90/3.5

 

Done