Size 4 (?). Removeable collar used with both the 1940 & 1941 pattern Sidcot flying suit. This example has lovely soft dense honey coloured fur on the same thick cotton canvas backing that the suit is manufactured in. Shows light use and wear. Quite clean and good colour. Size & King's Crown marks. Also has a faint 1944 date stamp. The sizing of these collars is not an exact science and sometimes collars with the same markings differ in size. In our experience most collars will fit at least one size either way of the indicated size. Good used example. Stock code S18591.