Quiñones Hardware Corporation

Monte 214-222, Havana, Cuba

This firm produced perfins from 1917 to 1919.

There is but one known QHC perfin cover:

Used 29 January 1919 to Erie, Pennsylvania, USA

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And here are some of the stamps which have QHC perfins:

                 

  An advertisement from 1918, two years after its founding.