I was lucky enough to pick up these rather nice veteran Brooks cases recently. Both are motorcycle items and each with a clip on the rear designed to attach to the rear carrier. The circular case is a B535 Motor Cycle Spare Tube Box and the rectangular a B539 Repair Outfit Case.
I cannot pin point the exact years of production but both appear in the 1911 and 1919 Brooks Book catalogues. I think this is roughly the span of their production.
Both cases shall be sympathetically restored and will find a home on my 1919 Quadrant.
