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This is one of the two Rola 6x10" that came with this Supro. Sometimes these are are referred to as 6x11" or 11x6".
The last time these were produced might have been 1958 or so. Unfortunately, the company that Rola originally contracted with for manufacturing has since scraped the stamping moulds. The cone stampings seem to be long gone as well, so they cannot be reconed. These have the square magnet enclosure. I think the earlier ones had a round magnet enclosure.
Vintage 47 Amps is the best source for replacement 6x9" speakers. I've got a pair on order.
This one needs a little work. The other one seems to be fine, and sounds good.
Here's the spider, click on the pictures for a higher geometry.