Yea... I one had a Sterling, Minni Mambo. Had an 0.49 on it. Chased that thing all over the county every weekend. The Bonner ,Compound escapement mentioned, was a very good escapement and was battery powered but.........you had to remember your last in put (right or left) because it was a "sequencing" escapement. Whereas the compound escapements would always return to center. 1 blip right, 2 blips for left. Bob