Hey Travis, beautiful 730 propane your grandpa has there! Great pics!
Last couple years I’ve seen JD 730 propanes sold at auction anywhere from $1,400 on low side up to $5,775 on the collector side. Here’s a pic of the ‘59 model sold for $5,775 on Mecum Gone Farmin’ collector auction 11/8/19 in Davenport, IA.
Mecum also sold this '59 JD 730 propane on 3/30/19 collector auction in Davenport, IA for $4,988.
Saw another JD 730 propane sold for $3,600 on central Indiana auction and another '59 model 730 propane for $4,500 on collector auction back in Iowa. Lowest price of $1,400 was on a collector auction in Colorado but in just “Fair” condition.
Hope this data helps a bit Travis!
Pete
Machinery Pete
www.MachineryPete.com