This was marketed abroad by Suntory and there does appear to have been a “Discover Suntory” campaign in the U.S. in the late 1960s that featured this brand. I say this because of this magazine advert:

It features our “Extra Special” bottle. This photo appears to be from the same campaign and its owner told me that his 1967 dating is based on a clear July 2, 1967 date on his slide mount (I have also dated the TWA campaign in the same picture to the same period). I think I can tentatively conclude from this that the “Extra Special” version of Suntory Old was sold abroad around 1967. It is almost definitely post 1963, because it is not described as being made by Kotobukiya, which was Suntory’s company name before that date. The “Kotobukiya” name is echoed on the label, however: the kanji in the middle is “kotobuki”, which has meanings associated with congratulations, happiness and long life (the same kanji is featured on a lot of neck labels for Suntory Old).