The Intermec Postage Validation Imprinter trial that took place in the late 1980s produced Postage Due stamps in addition to postage.
Type PDX-A1A in the 2001 edition
PD-G1. Intermec (digital), January to March 1986. [RRRR]
From the same system that produced Type PO-B5.2 but instead of an eagle design the stamp has large negative "POSTAGE DUE" across the top.
Four machines (000009, 000010, 000011, and 000012) were used in Vienna Virginia (VIENNA / VA). Postage Due stamps have been seen or reported only from 000011 and 000012.
V/F: Ø.ØØ
NOTES:
Postage Due stamps from machines 000009 and 000010 may exist but have not been seen by or reported to us.
These stamps are known only a mint tapes sold to collectors. No covers properly franked by this stamp are known to exist.
Presumably a Postage Due version of Type PO-B5.1 was in use from July 31, 1985 to the end of that year, but no examples have been reported.
Type PDX-A1B in the 2001 edition
PD-G2. Intermec (digital), March 1986. [R-RRR]
As Type PO-B5.3 but instead of an eagle design the stamp has large negative "POSTAGE DUE" across the top.
It is safe to assume that each machine described for Type PO-B5.3 was able to produce Postage Due stamps. Listed below are those seen or reported:
A. Used in Vienna, Virginia with town mark:
- Vienna / VA : I8600101
- VIENNA / VA : I8600155, -156, -157, -158
B. Used in Tampa, Florida:
- TAMPA / FL PO 33630 : I8600115, -120, -123, -130, -163, -176, -180
- TAMPA / FL PO 33629 : I8600122, -127, -148, -177, -178
C. Used in Saint Petersburg, Florida:
- SAINT PETE / FL PO 33730 : 18600136, -140, -150, -152, -165, -175
E. Used in Denver, Colorado: DENVER CO 80202 : I8600220, -232, -236, 247, -267[RR]
F. Used in Washington DC: WASHINGTON / DC 20016 : I8600192, -206[RRR]
V/F: Ø.ØØ
NOTES:
The early labels used in Vienna, Virginia did not have anti-peel slits. Starting in late 1986 or early 1987 labels with anti-peel slits cut into the edges came into use. All stamps from the other locations were printed only on labels with anti-peel slits. The Vienna stamps without the anti-peel slits are relatively scarce.
Nearly all these Intermec Postage Due stamps available are mint tapes sold to collectors. Just a handful of covers franked by this stamp are known to exist.