Futurebat

I'm curious as to whether adequate quality replacement parts are available for aging Valjoux movements, especially the chronographs which appear to suffer predictable ailments, which one assumes will over time exhaust the small reserves of old watchmakers cabinets. As modern makers as well as enterprising counterfeiters seem able to reproduce small parts in quantity, has anyone yet considered this other direction to take for their talents? I shudder to think how bad parts would destroy the vintage market, but as NOS is the gospel tag on EBay offerings, might there be the alternative, to produce high-quality replacements for the weakest links in old watches? I have a couple 100-year old pocket watches with poor histories, yet I think I can detect replacement wheels by the dramatically different sheen and patinas - at one time this must have been the norm for working timepieces. Watchmakers, at one time, were actually that, namely ones who could actually re-make a part from stock or such. Any insights from readers here?