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As far as the RCA unit, that's the WR-64. I have the WR-64B and the WR-61A. I believe the 61 is older than the 64. I think the 61 might have been the first. I'll put up a pic of the WR-61 later, it's color bars only, it doesn't also do the dots and cross-hatch pattern you get on the 64.
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