Just picked this up from Paul Mathias for summer wear. It will replace the A-1, which will go to EBAY soon. It’s a simple design, zip front, buttoned patch pockets, knitted cuffs and waistband. Obviously inspired by period flying jackets, but less overt. No label, it has probably been relined in the past, so no indication of maker. The zipper is a Lightning - does anyone have a better idea of a date for the latter?