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[Bonzo75]

Look like the earlier frame. Show us the back side.
The earlier frame was designed for mounting on the back side of the baffle. The 16” frame can be rear or front mounted.

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[RonSSS]

Wasn’t exactly what I meant by the back, but those are the early 15” frame. Nice drivers btw.

As Bowtie said, the 16” frame will accommodate the earlier bolt circle. But I believe there were early cabinets that physically couldn’t accommodate the width of the 16” frame. I’ve seen photos where a band saw was used to narrow the driver to get them to fit in the cabinet.

[GM]

Yeah, all three of my now long gone, by then decades old, 'freebie' 210s were in retrospect too narrow for the wider frame, but this was in the early '70s, so well before the 15" became NLA.