Postal Tax Stamps of 1936
These tobacco tax stamps have been overprinted as
postal tax stamps to raise money for national defense.
Postal tax stamps are not intended to pay the cost of postage. They are sold to raise tax revenue for other purposes (in this case national defence). The use of such stamps on mail may be obligatory for a certain period of time.
The stamp on the left depicts a worker and is intended to raise money
for the Social and Rural Workers' Insurance Fund. The overprinted stamp
on the right adds a two centavo surcharge for rebuilding the post office.