Longines 18.69 N blue alloy mainspring #770 with T-end | eBay
Longines silver (.925) lever pocket watch, import hallmarks London 1910, unsigned cal. 18.69N 7 jewel movement, with compensated balance and regulator, no. 2433247, the dial with Roman numerals, minute track and subsidiary
Longines, axe de balancier cal 18.68Z, 18.69Z, 19.69Z,V90