I'd need to see the top of the lid to be sure. Could be a No. 15 (diamond herringbone), No. 47 (dotted), or No. 88 (smooth) case depending on the pattern (or lack thereof) on the lid.
Edit: If I were gambling just based on that one photo I'd guess it's a No. 15. The curved portion of the blade holder/razor rest looks wider like it wants an Aristocrat handle in there. Also, the No. 88 may not be a likely candidate without the diamond logo on the headliner.
I'm thinking either a Popular 47 from 39 or an Australian !5 (CB) from 48. The maroon case lining leads me in this direction although I suppose a 38 version of the 15 could have come in cases with blue or maroon or ??? lining.
1950s British Aristocrat. The top cover and the flip-up blade holder are a match. The only difference is the OP's picture appears to have a red velvet lining and mr-razors' example looks to have blue vinyl.