Just bought this razor

Very nice razor. It's a Gillette Tech. @Mark1966 is our resident expert here but my guess, based on the case, is a Tech Set 24 made in 1956.

1956%20(B1%20on%20blade)%20No24%20Tech%20England.JPG
 
Nice Tech @David7307 !

It will be a #24 of some vintage - we don't know the production runs for the British made razors - just date them from advertisements. I think I've seen these through to the 1960s
 
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