Im not smart enough to tell just by looking, but heres a few tidbits that may or may not help.
A genny dont necesarily know its output voltage, its increased if you turn it faster or pump more current through its field coils
Some old Delco gennys that had a black tag were 6 volt while 12 volt had a red tag
Seems like a lot of 6 volts Ive seen had closer commutator spacing (smaller segments) then the 12 volt units
The open unloaded output voltage dont tell you all that much as it will be considerably higher then if coupled up to a load like a big electron bank such as a battery.
If theres a way to answer your question by using an ohm meter, I like JMOR's approach since the field current is one of the most relevant parameteres and their resistance corresponds to the gennys voltage. The fields typicaly may pass say 1 to 4 amps and if a body had the Delco specs he could determine if they are for a 6 or 12 volt gennys butttttttt if he had all the specs he would likely already know what genny it was!!!!!!! I have some specs and maybe knowing the field resistance (As JMOR posted) could answer your question??????
If theres an old fashion mom n pop genny alternator starter shop near you Im sure they can tell either by resistance checks or better yet hook it to a load n spin it
If you posted the tractor make n model number on the appropriate (Ford, IHC, JD etc) forum they can likely tell you what it had originally!!!
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