Nice piece Baldy, I've been looking at one of them too. When I was stationed in Pensicola in the late 60',early 70's I bought a Mark 1 and I loved it. Now that my wife is getting back into it and wants a pink Sig skeeter, I want to go for a 22 also so we can shoot together without scaring her half to death with one of my 1911s.
The best part ammo is cheap. Good luck with it, it's a beauty.