From my observations, dash one only reliably signifies a 617's frame having the new rear sight and being drilled and tapped for optics. It appears that existing square butt frames were used up in early dash one production and all of those that I've seen wore wood combat stocks but I wouldn't be surprised if the last of the square butted 617-1s shipped with a Hogue rubber stock. Except for Performance center 617-1s, all the round butted 617-1s shipped with rubber Hogues as far as I know.

This strays off topic, but I haven't had a place to be a "pondsideshooter" for quite a few years. "stopping power" remains in dispute, but there's no doubt that .45s sink aluminum cans faster than smaller bores. (wink)