Not directly but if you check out oldroads.com and find their discussion areas there is on for "balloon tires" and you may find some info there.
The only Murrays I had direct exposoure to were dep't store 10 speeds from the 1970s. Nothing too special there.
Yours sounds more interesting.
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“Life is not one damned thing after another. Life is one damned thing over and over.”
Edna St. Vincent Millay