That's not a straight razor, a straight razor opens like a pocket knife.  Whatcha got there is a double safety razor.  
And as safety razors go, that is a whale of a set!!!  Lucky you!  I use Williams brand shaving soap and a badger bristle brush along with a modern razor.  I would love to pick up a safety razor like yours some time. 
From time to time (typically when in Rendezvous camp) I will break out my straight razor, strop, towels, two gallons of boiling hot water, and shaving mug with soap and brush to do a righteous shave.  Before I am done with the shave, it's typical to have a dozen people standing around taking bets on not only whether I will cut myself but on whether or not I will survive the cut.  Nice thing about a straight razor shave, I can usually go another extra day without shaving.  Baby smoooooth!