'X' in the deadwax usually - but apparently not always - signified Pitman, NJ. The texture of the colors on the label suggest the pressing came from either there or Terre Haute. (Metal parts on Columbia pressings in this period, mostly LP's but in some cases even 45's, usually got around a lot.) I have a bona fide Santa Maria pressing of this one, where the red and orange colors were a tad lighter. But all plants, apparently, used Pitman label copy type.
Added back cover and label images. Here is a query for our esteemed W.B.lbl: The deadwax has "SX T" where the pressing plant identification would normally be. Does this mean that the stamper was originally used at Columbia, Santa Maria and then reused at Columbia, Terra Haute?
Original issue LP's contained a folded B & W 22" X 33" poster. This is the only LP released by Art Garfunkel under just his last name Garfunkel.