The description states it was an electric motor 😉
FREE SHIPPING WITH BUY IT NOW IN THE US HERE IS A 1937 BENDIX ECLIPSE ELECTRIC MOTOR IN THE ORIGINAL SHIPPING CRATE IN EXCELLENT CONDITION POSSIBLY NOS. SERIAL #5A1702.IN 3 YEARS THERE WAS ONLY 7,344 OF THESE MADE WICH MAKES IT A RELATIVLY LOW SERIAL #.GM WAS THE MAIN STOCKHOLDER OF THIS AVIATION CO. AND THEY WERE SAID TO HAVE SOLD TOO EARLY THEY HAD A GREAT PRODUCT AND PROBABLY WOULD HAVE COMPETED AGAINST THE LIKES OF MERC AND JOHNSON FOR THE TOP SELLER.THIS IS A MUSEUM QUALITY PACKAGE AND I CANNOT IMAGINE FINDING A NICER EXAMPLE HAS A PARTIAL RAIL SHIPPING TAG ATTACHED NO RESERVE