Here is a good used Johnson antique outboard motor ignition coil.  This originally came from a 1937 Model DT-37 but it will fit all the following 5hp outboards from 1937 to 1940: DT-37 DT-38 DT-39 and DT-10 plus LT-37 LT-38 LT-39 and LT10. Tested hot.  We have diked the old rotten ignition wires just past the coil connections. You will have to solder on new ignition wires. Includes the mounting screws and hardware but not the coil heels.  You will have to use your old ones on this coil.  Johnson part number is # 72-1072.  Look at the photos and email with questions.  Thanks for looking.