1960s Parker Converter with 45 & 75

An example of a (second-generation) 1960s Parker converter, with two pens that I know that it will fit into and work in.

Top-to-bottom:

Parker 75 (in Ciselé Sterling Silver aka ‘Crosshatch grid’);

Second-generation of 1960s Parker squeeze converter;

Parker 45 (in the brushed stainless steel finish aka ‘Flighter’).

The converter in this photo fits into, and works in, my Parker 45s and 75s.

It may also fit into other early Parker c/c pens, such as the c/c “51”, c/c 61, ‘Falcon’, 180, or the ‘Premier’ model that was based on the 75.
N.b. I don’t own any of those pens, so I cannot say whether it will, or whether it won’t fit them.