50 Baht Type I, red 50 on reverse

Thailand's wartime finances were a tangle of Japanese pressure and domestic improvisation. This note was issued by the Thai government under the terms of the 1942 financial agreement with Japan, which effectively tied the baht to the yen at a fixed rate deeply unfavorable to Thailand. The printing infrastructure was severely strained — Japanese occupation had disrupted normal supply chains, and multiple series were produced under constrained conditions to meet demand.

The "Type I" designation with red overprinted 50 on the reverse distinguishes it from a parallel variant, a distinction that matters more than it might appear: the two types were not interchangeable in their issuance sequence and reflect adjustments made mid-production.