[Arran]

http://www.ebay.com/itm/271818948995

Here's one on the auction site. I think it's overpriced, personally. If you were seriously interested in this speaker, I would find out and make sure this was from a 610, and not from a 611 (AC/DC, different field coil).

Ron;
 Everything that guy has is overpriced, he wants $25 for a set of Philco rubber shock mounts, the kind that fit on the corners of the chassis, I would guess that they were pulled off a chassis, just like everything else he has. I mean, why settle for a set of fresh reproduction Philco shock mounts when you have have a set of 70 year old dry rotted ones instead?
 With regard the speaker, or speakers, yes it's not very well documented what they came out of, though some look like someone wrote out the part number in felt tip pen on the field coil bracket.
Regards
Arran