It's for a 1911 for sure, but it could be stretched to fit, from memory a tight fit on a 1911 will not fit a P220, so likely it was a 1911 rig fit could be anywhere depending on what it's had in it over it's life. The length is dang close to a 3.5in. 1911 but that's if they designed it like I would with coverage on the muzzle. Likely they didn't since it's common to have open muzzle on these style of rigs, so it could be for a commander, or full size with an inch or so hanging out the rear.
Either way that's my read of it;)