I think all 3 on the left are Triple-K variations, but from different eras. I have a 1972 Triple-K catalog here, sadly without magazine photos, but with some cover art that displays magazines with properties I see in both the middle ones. In 1972, the magazine was $6.00
The catalog gave a general retail value of the pistol of some $60.00
Triple-K is derived from the first names of Kim, Kurt and Karen.