The X-Men 1963 #135 Newsstand ed. - 6.5 - $37.00
No copyright registration was filed for the issue. As such, there is no official on-sale date. However, the issue all but certainly first went on sale in March. According to copyright records, the reported on-sale date for issue #134 was February 26, and the date for #136 was April 29. A March on-sale date is consistent with that. Also, at this point in time, comics in Marvel's color-newsprint line were going on sale in comics stores four months ahead of the cover date.
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