No-one ever mentions the Ruger Mk.1......
They don't get mentioned frequently because they have not been made for a lot of decades. And they seldom show up on the EE or other places for sale since those with them are commonly keeping them.
Same issue with Mk II's. But I come across those more often in the used area of gun shops and on the EE here.
So we're "stuck" with the current Mk III production model. Which isn't so bad since the silly stuff in them isn't that hard to swap out.