Nice catch on the variation - I'll have to check my sets and see what I have. My guess would be that the 1974 tagline was the first printing, and the other would have been the second or third run. Bob did a similar thing with his 1967 WS set - the original print run has his address on the bottom of the back, while subsequent runs didn't. He talked about making subsequent runs obvious, but this is the first time I have seen that he may have done that with the 74 set.
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