The JD pony coil should work on the Eisemann 62D magneto with the modified laminations. I believe some others have also tried using a Briggs & Stratton twin cylinder lawnmower coil. As Tubs noted, some folks have had success with the pony coil or B&S conversion whereas some others have not.
You are correct that both the Wico and Eisemann coils are hard to find parts. There are a couple sources out there for the Eisemann coils used in the old Maytag motors but those typically used the 72D magneto and I don’t know if those would interchange with your 62D magneto. I do know the coils used on the 62D and 72D mags have different part numbers which might suggest a different configuration or they could just be different numbers solely due to the different magneto numbers.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp
“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
