The Elgin grades 760 and 761 are automatic (self-winding) watches, designed and built in America by the Elgin National Watch Company between 1958 and about 1960. These movements are believed to be the only automatic movement ever made in the United States. Other Elgin automatics from this era are Swiss imported movements. These watches are relitively rare and parts are very hard to find.
The 760 is the base grade. It is a 30 jewel model. The 761 is a 27 jewel variation. Most parts interchange between the 760 and 761, but not with other Elgin models. Both movements feature sweep seconds, a Dura-Balance, and a unique non-regulator beat adjustment device.
The 760 and 761 movements include many innovation features and are often refered to as forgotten masterpieces.
The Elgin Service Bulletin, 1960: