Need some help identifying my DW

[Flash]

I just purchased a 2 1/2 stainless 357 with interchangable barrels and a small, round butt grip. I am thinking 714 but not sure. Anyone want to help? Will a 15-2 grip fit it? It's a Monson gun with a 4 digit serial number. It's got some nicks and bruises but that wil clean up.

[blhof]

Model 14 has fixed sight and 15 is adjustable, all small/med frame DW grips are interchangeable, except the 38 special, which had a slightly different grip.  The stainless is either a 714 or 715 as the 7 denotes stainless.