I think that really depends upon the particulars of a given vintage watch and exercising prudent judgment when purchasing. Speaking strictly about Omega vintage watches, you're unlikely to lose money over a longer term if you purchase collectible Speedmaster Professionals in good condition at fair value. I think the same can be said for some Constellations with pie pan dials, some Seamaster models with special dials, some cursive Geneve models, Rancheros and some military models as well.