Bike info from very old photos?

[roadking]

Yes of course - I know you're right, but I use the term 'head badge' very generally to just mean the logo/crest on the head tube!
Looks like a stunning collection of bikes by the way.

The badge/decal is usually found on the seat tube in between either two rainbow bands or two rainbow chevron bands.

My Hobbs have been in my family from new (1950 & 1951, the '51 was bought specially for a tour of the Loire Valley - they both went though).

Jon.