Thread: A safety straight???

I received a package in the mail today, with 9 vintage razors I won on Ebay for €12.
Most are good candidates for restoration.
There was also a weird specimen, that looks like some sort of safety straight razor. There was a detachable blade locked in the razor, and it shaves my arm hair right out of the newspaper it came wrapped it.

On the tang it says:
PAT. U.S.A.MAY 28.07
AND FOREIGN COUNTRIES

On the other side:
MADE IN U.S.A.

on the front piece of the blade fixture:
DURHAM DUPLEX

and a logo with two lions and the initials "DD"

If anyone can share any further information, I'd be much obliged.

Thanks,
Bart.