Your collection is simply stunning, Blomman! Very inspiring material for someone only recently discovering the charm and appeal of vintage GP. I own a very cool ref 2498 (black dial, steel bracelet) and a ref 49900 (light gray dial, steel bracelet), wearing them often, in rotation with a Grand Seiko 62GS (steel, silver dial, black ostrich strap) which I absolutely love, and a Glashütte Original Sixties (steel, silver dial, rose gold hands and markers) I only pull out for special occasions. So I'm already into watches with a distinctive period design language in the sub 40mm diameter range... Wouldn't yet know where to start if looking for a vintage GP, but a Gyromatic HF seems like the obvious choice...
The 70's were so much fun!