Tenorio mentions that the first, and rare printing in offset of this stamp was issued March 16, 1939; and that the first typographed printing was issued November 4, 1939. The following cover is from June 1939 and bears two typographed stamps. I have previously shown other typographed specimens postmarked before the issue date mentioned by Tenorio.
This cover has a dated company stamp on the back.
Here are details of the stamps, showing the treaits of typographed stamps: extra ink outside the design, and outside the upper right corner.