Vayolene, a belated thank you for the link to the 2014 Cherrystone auction that featured a very similar card. The Cherrystone write-up was succinct to say the least. It consisted of the following: "1952 stationery card with the slogan "Unification through crushing Communism", unused, v.f." Cherrystone's estimate for the card was $130 - $150. I did not go so far as to find out what the winning bid, if there was one, was.
As further follow-up to my question regarding the Korean postal card the following was provided by a member on Richard Frajola's wonderful website in conjunction with the editor of Postal Stationery (bimonthly publication of the United Postal Stationery Society - www.upss.org):
"The red 5 won card was never issued, because inflation made it obsolete when it was printed May 1, 1947. South Korea only issued it with handstamped surcharges, in many increasing denominations in many different styles. Most were modified cancellers that showed a rate rather than a date. These items exist mint, and if used, had a regular cancel applied. This item was intended to use up the obsolete stock when the rate had reached 500 won. It was issued December 25, 1952. The slogan at top reads "Unification through Crushing communism"."
And that, ladies and gentlemen, is as far as I'm going with this.