Both the exposure and the gap matter. 0.09 is not a big exposure. But I wonder how did you measure it is 0.09.
I didn't, @ShavingByTheNumbers did it several years ago. There are all the measures --> HERE
Just in case check if on the top side of your bottom plate there is a country of manufacture. Both my black handled Techs don't have anything there.
Nothing stamped either on the bottom plate.
T2 means 1973.
(...) But I doubt they are made in Germany if there is no stated country of manufacture. Not sure they kept making Techs in Germany in the 70s. Lots of English manufactured Techs and TTOs without the country mentioned on the head.
Ok, but i thought that Gillette England never used date codes... That's why i concluded it was a German made.
Plus, the zamac head of this 70s Tech : a material which was used very often by Gillette Germany. And by many other german manufacturers, like Merkur for instance...