Excellent/Very Good Conditioned Sports Messenger Bag. 
Made for Royal Sutton Cross, possibly cycling club.
One faint scrape to rear bag, see last photo.
Adjustable long top strap, can be worn across body.
Long top opening zip. Front side pocket.
Ideal for scooterist, weekend rally goer.
Measuring: Approx 16" x 13" x 4" excluding handle.