Might be a long shot but you might try Bob’s Small Engine Repair in Iowa. He had a replacement Eisemann coil for my twin cylinder Champion outboard a couple years ago and I recall he told me he had some other Eisemann coils available. Maybe he might have one for your 61B magneto. If not, as Buc noted you might be able to swap in an OMC universal coil.
http://www.bser.com
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
“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."
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