Got the answer elsewhere, they're Series 1. Apparently, series 1 901s were only identified by a lable, paper or metal, attached to the bottom of the cabinet adjacent to the connector post cut-out. When I purchased the speakers, the owner had them suspended from the ceiling by wires connected to eye-bolts screwed into the speaker base. Those holes are right where the label was placed by Bose. Also, looking at other 901-1 pictures, the staple backers, under the grill, are exactly where mine are located, not where the Bose 901 I&II manual shows them to be.
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