England.
I have been in touch with the maritime museum in Gdansk to ask if there is any relationship between the razor (from the 1930s) and the ship of the same name ... and they emphatically state there is no link. We do still believe that there might have been a GROM razor in Poland as a brand which Gillette managed to take over and rather than bury the name, Gillette cleverly put their own razor (the 'New' type) in its place and continued the branding ... as they did with Nacet, Minora ... 7 O'Clock, of course, which was intellectuial property of AutoStrop who (re-checks history books) came to techically own Gillette 1932. You can look up Gaisman and the blade patent wars ... and the subsequent litigation against Gillette for infringement which to settle, pretty much Gaisman was handed the company.
Anyway, I love showing off ... here's my GROM:
Lovely acquisition
@Shaun2