Hi and welcome.

Are you planning on purely collecting vintage razors in their found condition or are you planning on shaving with and restoring the razors you collect?

Rarely will you find a mint condition vintage or NOS straight razor and if you do, get in line with a hundred other guys with money to spend (i.e. the prices can be high for these).

If you're planning on purely collecting razors and nothing more, then I would say you'd probably be most interested in looking for razors with unique scales (handles) that appeal to you. Since scales were made from bone, ivory, tortoise shell, horn, metal, celluloid, mother of pearl, they can have many more variations that knives.

I hope that helps.

Chris L