Nice find. Partial underlug based on your photo and those are a bit harder to locate but certainly not rare or uncommon. A good many of them ended up as service revolvers and some of the ones you find for sale these days are re-imported from overseas and marked as such. I was looking on and off for a few years for a domestic example in decent shape at the right price (that last part being the hard part.) I finally found this one a couple of months ago for $365 and grabbed it. It cleaned up nicely and now wears the compact grip as it was meant to have. Nice guns.