Mark Steinke asked about what bars might be on his Gitane TdF and said....
<< the original stem is a "3ttt RECORD mm105" made in Italy. I maybe
should have mentioned that the bike was built for a guy who never came and
picked it up >>
There were quite a few 22.0 3ttt stems "back in the day" - I have two in use at the present; one (w/3ttt bars) on a '69 PX-10 and also one on a '78 Motobecane (w/Nitto GR bars); Clamp diameter is 25.8mm for each. I suspect your bar is a non-engraved GB (just with the marking at the end - which is usual) which would mate with that stem quite nicely.
GB bars were spec'd with 3ttt stems on Raleigh Pros and RRAs also 'Back In The Day'
Cheers,
Chuck Brooks
A Very Wet & Humid
Malta, NY