Just picked this up RAF issued Omega 6B/542 Fat Arrow 53 was on the hunt for a 58 as a birth year watch but they were double the price. Went for this one it had a few issues like some damage on the dial and the second hand probably got replaced when the dial got damage in military service and was told the crown a replacement and it was serviced and got it for a OK price. This has a mod replacement fat arrow dial. The case 37mm with 18mm fixed lugs with a hand wind 17 jewel cal. 283 movement. Nice watch and mite be a daily wearer for now.