1951 Academy Award "O". Just received. Replaced the broken band and wiped it off, so far that's it. Purchased as "probably just needs a battery". It started running with a 3/4 turn of the crown and is currently keeping accurate time. Interesting Roman numeral "pie pan" dial on a 21J movement in a case very similar to the Duo Wind and Thayer of the same time period. Case back and movement both marked L1.
Ad is dated 1952.