I won this on eBay for $10. It looked like a 40's superspeed to me, but the description says it has "Brit. pat. 634023" in the TTO doors. Is this a Rocket?
I'd say that its actually an English Aristocrat Junior (rocket style) - English versions (unlike the USA ones which were identical to the Superspeed) had a solid turning knob.
This is one on Achim's site:
http://www.mr-razor.com/Rasierer/One-Piece solid guard bar/1950s Aristocrat Jr.Rocket style.jpg
I suspect that yours has a solid turning knob (although I can't see it)
Hope this helps
Dave
I do think you are wrong on this one, Dave.
Width of the knob is clearly the same as the handle, so it's a (British?) Parat.