I know it's an alternator, but WTF???

This big heavy thing came in a package buy of parts some of which I needed.
It looks kinda like a Mopar "flat back" alternator, but it's half again as big and the connectors are like none I've seen.
The stacked "FLD" connectors read 3 Ohms from one to the other. (Meaning the field coil is OK??)
Anyone know what it came on and if it has any trade value. Thanks! BC