update: off the market
I took this holster in on trade with some sigs I bought. I have determined that it is looks like a Miami Classic. It is marked Galco. It does not have the tension adjustment screw.
Per customer service, it was made for a Sig 230 but it fits my Sig 228 with the safety strap going around the hammer and snapping. Here are photos. I will take checks, money orders, cash, paypal plus 2.9% or would prefer trading for factory sig 228 (13 round) or 220 mags.
The Galco Miami Classic has changed in design over the years from this early type to the current model, as I found a web ad showing the design of this model from several years ago by Belsco, Inc. advertising"Leather Shoulder Holsters from Galco...Miami Classic...Belsco Price $149.95; Tie Down Ammo side $14.95; Tie Down holster side $14.95"
The site is:
Any way you look at it, this is a great price. http://www.usgalco.com
This comes with the dual mag pouch and tie down straps for both the holster and mag pouch.
Note that the buckle is made of plastic that attaches to the gun's pouch.