1. Intaglio latent image "50", hidden inside the
elaborate design, becomes visible when the note is
viewed from the lower left corner toward the middle part
2. The Arabic numerals "50", printed on both sides, is
completely formed upon viewing the note from
the front side against the light.
Date of Announcement : 19 March B.E. 2547
Date of Issue : 1 October B.E. 2547