Nice Razors!
Most of them have Celluloid scales. They must have been stored in a good environment to still be nice.
Do your homework for preservation. Keep them clean, blades lightly oiled, in a cool environment that will allow for air exchange.
Keep an eye on them. Display them with the blades open( if possible) and turn on occasion.

Hit the search box above right and type in Celluloid/ Celluloid rot to see many threads on what the enemies of this history are.
One rotting set of scales can ruin them all if kept in a sealed environment.