Ink Jet Dynamic Print Time Sheet Markings
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The Harrison / De La Rue manufacturing facility at High
Wycombe housed the Jumelle press since it first came into operation in 1972
(the earliest recorded printing was 3p Royal Silver Wedding Special Issue Cylinder
1A 1B 3C phosphor P33 issued in November 1972) and was Harrisons principal printing
press for some thirty years. As well as the press being capable of printing
in gravure and intaglio, it had the capability of running two print jobs simultaneously;
typically a Special Issue from one end and a Definitive Issue from the other.
Obviously, this meant a number of features on the press were duplicated including
two perforating systems, two sheeting units, two sets of security numbering
During 1997 / 1998 the Jumelle press underwent an extensive
refurbishment. The intaglio unit was replaced by three additional gravure units
(bringing the total to 10 gravure units). As well as new APS perforating systems
and Eltromat automatic colour registration systems, the crash stamp numbering
units were replaced with new Domino Ink Jet numbering systems.
Counter sheets are found with two printing types for
the Sheet Markings, namely :-
The dynamic print time sheet markings traditionally produced
Sheet Serial Numbers (SSN) only. This was extended to include a warrant number
from September 1991 and then a date the sheets were actually printed (as opposed
to the date of issue) from April 1993 (Enschedé printings). From these
sheet markings one can see how the printers serviced the warrant and attribute
errors / colour changes, etc to specific print runs.
Jumelle (De La Rue - High Wycombe) dynamic print time
sheet markings were printed centred adjacent to the side marginal arrows.
The first recorded instance of the use of the Ink Jet
printing system is for Warrant 641, Dated 09/06/98 on the 20p value. Its interesting
to note that the 20p British Land Speed Record Holders special issues had crash
stamped dates on 18-06-98; 22-06-08 and 23-06-08 indicating the replacement
of the Crash Stamped numbering systems must have occurred mid year, apparently
during the May / June period.
The early printings of the ink jet dot matrix used a
character set with 5 dots for the oblique character - this can be seen in the
following example :-
A change was made to the composition of the character
set in early 1999 - this can best identified on the oblique dot matrix character
which went from using five dots to seven dots; the zero also exhibits a variation
with 3 dots at top and bottom (this was 2 dots previously).
The key dates when the dot matrix structure was changed :-
During 2002 Royal Mail deemed the Warrant Number (first
introduced September 1991) was no longer required to be printed on sheets and
so was dropped, this gave a new Ink Jet Numbering format :-
The key dates when this change occurred :-
Three other variations are worth noting. The first variation
involves different spacing that separates each element of the Dynamic Print
Time Sheet Markings as the following examples show (both coming from the 1p
To a lesser extent variations in the size of the print can be found as the following
examples show (both coming from the 19p value; the date 12/06/00 being taller)
Its unclear whether this variation is just the result
of the setting of the print head distance in respect to the web.
Initialisation of the print variables
Incorrect / Error in set up : The 38p with printing date
24/02/99 exists with warrant numbers 655 and 695. As the 38p was a new value
issued for the rate changes for 20 April 1999 its likely 655 was a mistaken
set up (as opposed to a previous warrant being fulfilled) and used before being
De La Rue (High Wycombe) finished printing operations
on the Jumelle press in December 2002 (the Jumelle press was subsequently sold
to a company in China). De La Rue's manufacturing
facilities were transferred to Byfleet in Surrey in early 2003 utilising the
equipment that had be acquired as a result of the purchase of The House of Questa.
The key dates for the final Jumelle printings are :-