The top latch should be leather with a snap, if it is then a 1908, 1909 Single ring case.
Yes, looks like 1920 Old Type Standard set no-468bI would say that is the one. Mid 20s.
Shamelessly copied from Achim's site .. this one fits the bill, mebbe, with some color change over the years .. the clasp looks right, as does the faux gator cladding ..
nice find - you see not often this case. The blades in my set are from 1928.