Stumbled on some treasures (perhaps)

[aengelhardt]

So, I am currently home for thanksgiving. My father is aware that i startes using a straight to shave. He stumbled upon this in a box of family artifacts. These were used by my Great Grandfather, in Paris, Pre WWII. They seem to still be in great shape and are just a little dull. I was wondering a few things:

1. What needs to be done to get them into 100% safe usable shape?
2. Why is there a separate razor for every day of the week? From the information I gather here, a well taken care of blade should last a lifetime.
3. Does anyone know what the setup we have stumbled upon is worth anything?

Thanks for all of your help with the issue, and I hope you all have a wonderful thanksgiving.