bc1023, that's a fine looking model SIG heel release P220. I think the slide is a big improvement over the earlier SIG P220/Browning BDA "Dolphin Nose" slides.
Wanted a P220 in .38 Super and .30 Luger, but held out for the "American mag release" (side) instead of the "European mag release" (heel). Never saw a .30 Luger with a side release. Was too late to grab the couple of .38 Super side releases a local dealer had at various times. (Rumor has it SIG might bring back a limited P220 in .38 Super, but I'm not holding my breath.)
My first SIG was a P226 9mm, which got traded off for a P220 .45. The P220 became the home protection handgun for the next 30 years. Recently bought a P227 with a rail for a light to replace it for that duty, but will still keep it.
Picked up a P225 earlier this year. Always wanted one. Very nice handgun. I hesitate to call it a compact, as it is only compact when compared to a P220. Decades ago it was considered a compact. Recoil on the P225 is actually a bit snappier than the P220 .45. The latter gives a gentle push, while the P225 has a sharper recoil impulse due to lighter weight.
That's a nice collection of SIGs you have. Mine is more modest. The only other SIG I have right now is a recent P226 with the E2 grip set up, rimfire slide, centerfire slide, and barrels for .22 LR, 9mm, .357 SIG and .40 S&W.
I'm hoping SIG comes out with the P225A1 in .357 SIG. I think it would be ideal for carry. Hopefully they will actually make a P220 in .38 Super. Waiting for an all black stainless DA/SA 10mm (the closest right now is a two-tone). I doubt it will ever happen, but a P220 in .22 TCM would be a lot of fun. I think SIG needs to offer more cartridge options instead of more cosmetic options.