Not sure of the model number, but it's the Lipsey Ruger 1/2 underlug, Ruger rubber grips with wooden inserts, 5" barrel, adjustable sights, 5 shot. I have done more that a little business with them, and there is not much demand for 44 Specials in my area. I think the tag price was $585. And then the local tax of 10.25% would have been added to that. Seems like Lipsey had it msrp at $880 or so. Here's the add from Lipsey:
Ruger GP100 Ruger GP100 44SPC BLUE 5" HALF LUG 1770 ADJ SGTS/WALNUT GRIPS 44 Special RUGP4451MSRP: $869
And, shoot. I noticed in their latest ad had the walnut grips.