CG Auction #40, Asia section single lots closed 12 June 2018 and the prices realized are online. Let’s take a look at an instructive Republic of Korea (South Korea) lot: lot-nr. 9232A containing the 1948/49 observatory colour shades.
One of the interesting colour shades of South Korea is the 14 Won cobalt blue, described by the auction staff as:
“1948/49, Kyongju observatory in blue, dark blue and cobalt blue, mint never hinged MNH (Michel cat. 503.-) Michel-cat #43a (2), 43b.”
Started at 100.-, hammer price was 120.- euros (+ ca. 25% commission/VAT).

The average item with the standard colour is seen in the center. The scarce shade, cobalt blue, is at right. The item at left may be considered a weaker version of the standard colour.

This and other items in the auction can be found at the Gärtner website for CG auction #40 by searching for the term Korea for items offered and prices realized. Note that lots/collections are due June 15, prices realized will be online in the morning of June 16.
Copyright images: Auktionen Gärtner.
Thank you for this important clarification!
You are welcome!
florian