500 korun october 6, 1923.

P.18a.
This is the second highest grade! Series B - number 730848. This type is particularly rare and almost impossible to find in good condition! To date, only three examples are listed in the PMG population database (1x PMG 55: Top Pop). The Top Pop had been sold for 40,800 USD at a Stack's Bowers (USA) auction in August 2018.
PMG 25 Very Fine (1924014-003).
Very rare and fine example. Pr. TTB.