Vintage Fuel Cap Gas Diesel BUY CLEAN FUEL KEEP IT CLEAN Tractor or ?

Description

Old TRACTOR or ? Gas Cap Buy Clean Fuel - Keep it Clean
Condition is obviously Used and Worn. No cracks and threads are good.
Look at pics showing size with a measuring tape beside it.
Unsure of all the years and models this fits so you will need to know by using your knowledge in what you need before bidding.
Selling AS IS AS FOUND. Look at close up pictures to see as they are part of the description since this is not my area of expertise.
Pictures are part of the description.
Shipped via USPS First Class Mail with Tracking.