After the establishment of Note Printing Works, Series 11 consisting of five denominations namely 5 Baht, 10 Baht, 20 Baht, 100 Baht and 500 Baht were printed here. They were issued from the lowest to the highest denomination starting in 1969. In 1975, 500 Baht banknotes were printed for the first time ever, and the issue of this note first enabled the Note Printing Works to manage the whole production process, including the designing and engraving.
In Nov 1971, Field Marshal Thanom Kittikachorn staged a military coup, dissolved Parliament and appointed himself Chairman of the National Executive Council, and served as a caretaker government from 18 Nov 1971 to 17 Dec 1972. No Finance Minister was appointed during this time and the 100 Baht banknotes of type 1 (which were issued in Oct 1972) were signed by Boonma Wongsawan who was the Permanent Secretary to Ministry of Finance. This is the only banknote of Thailand ever signed by a Permanent Secretary. Boonma Wongsawan later became a Finance Minister between 16 Oct 1973 and 29 May 1974 and signed 10, 20 and 100 Baht banknotes issued during this period. See all above checklists for signature details.