@USrazor
All the tiny little details that you don't see brought into consideration, I'd say it was the 1907 patent Domino model that would have come in a red leather case (see 1st few posts). The earliest I've seen that model advertised was 1927.
I believe it would have been this set:
You are indeed missing a comb (and a safe blade). What you have there is the stropper attachment which puts the blade at the correct angle for drawing up and down some stropping leather. You can (at a push) shave with the stropper attachment, but you would need to be already a proficient straight-edge shaver. It's not advised.