Somewhere I got the idea that it's Price Pfister, but after poring over the Kissler catalog that seems impossible. It's got 16 points on the splined broach, and the valve stem is about 13/32" diameter and 5 1/4" [edit: corrected length]. The handles look a lot like Briggs, but Kissler says that Briggs have 18 points. I don't know if these are the original handles or not. The spout is almost certainly original, and looks pretty distinctive ... is that a clue? The escutcheons are Danco replacements; they're generally like the originals (which I neglected to save) but probably not exactly the same. Thanks for any help you can offer!