There are many opinions on face replacement. What we try to do here is positively identify and catalog original watches for collectors to reference. Basically by mybulova standards, replacement or refinishing to bring the watch back to identifiable factory condition is acceptible and the watch can be ID'ed as matching spot on to a period ad. In the case of extremely unusual early models, they can be assigned a name based on case but noting face replacement. On the other end of the spectrum, a (ex) 1950's watch with a purple refinished dial or a dial identifiable as coming from an unrelated model line or outside vendor is "non-conforming". Not a true factory spec model.
My personal take on subject watch from a purist collector standpoint is wait. leave it as it sits, movement, hands and face-wise. Service it and Let it rest in the "Unknown" vault. Perhaps one day we will be able to assign it a name. If installed dial turns out to be the correct dial, you muddied up a previously unknown model. That said, it's your watch, do what makes you happy :o)
One other observation; It appears that the crystal is a slightly mis-matched replacement, having a slightly rounded contour on top and bottom. It matches the case at top, but appears it should be flat across the bottom. No biggie, but that detail may help in one day identifying what the watch was named, based on replacement crystal specs. Crystal could be a "stand alone", only used on one specific watch. It's not standard practice to base an ID solely on crystal measurements, but often leads us in the right direction.
We do our best to be open, non-judgemental and cordial. We all enjoy what we are doing and want to keep it fun. Nobody here is an expert, we are all on the collector quest for pure documentable knowledge.