A banknote issued by the Việt Minh for circulation in the southern regions of Vietnam (Nam Bộ) which at the time weren't largely controlled by the Communists. 
<p>P-41a D-56 20 Dong 1948 
</p>
No watermark.
The Việt Minh.
<a rel="nofollow" class="external text" href="http://art-hanoi.com/collection/vnpaper/p41.html">Nam Bo 20 Dong 1948</a> (Art-Hanoi).