Hi Bob! Welcome! There were some telltale differences when the 640 and 641 tractors were new. After 50 plus years it's hard to tell how they've been amended. In the beginning the 640's tin would all have been grey, whereas the 641's hood would have been red. The 41's fenders and grill were grey.
The 640 would have had an ammeter where the 641 would have had an idiot lite for the charging system and a fuel gauge.
The 640 would have had fenders that swept out over the top of the tires, whereas the 641 would have had clamshell fenders that only shielded the inside of the tires.
Other than that some production date codes may pin it down. However, the best way would be to get through the paint and read the model and serial number.
You are correct onthe PTO. None of the 4 speed models had live PTO in that era.
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