If you are looking to collect as an investment the nameplate means nothing. It's all about the person who used it like someone famous or historically noteworthy. Maybe if the razor is of archaeological significance too.

Otherwise the market is too fickle. If you bought a Puma in mint condition in an unusual size you might have paid a mint for it 15 years ago and it would have gone down in value now.

For common razors" made for razors" have no relation to value.