The cap is the same as a CP200. You can still buy them. They made them with a groove and non grooved in the cap area. I can't tell by the picture. I think the one with the non groove was made first. Not sure but I think they made them briefly in the late 60s and then stoped making them for a few years. The lug nuts became standard in the late 60s and aftermarket wheels still use them. It looks like that wheel was made so you could use disc brakes.
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