Great Britain Machins by Adminware

1st Large Royal Mail red 2

NVI
Self-Adhesive, Security slits
First seen: Oct 20, 2016

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Also exists:

1st Large gold (NVI)
1st Large diamond blue (NVI)
1st Large Royal Mail red (NVI)
1st Large marine turquoise (Data Matrix Code)

Paper	Printer	Security Code	Other identification	Issue date	Source	Booklet singles	Gum	Backing Paper
2-band (9mm violet) phosphor
2016 year code
OFNP	Walsall	16 + F		Oct 20, 2016	Booklet	SAP168 SAP168	S/A	- Type 1
OFNP	Walsall	16 + B		Oct 20, 2016	Sheet		S/A	- Type 1
2017 year code
OFNP	De La Rue	17		Mar 2017*	Sheet		S/A	- Type 2i - Type 2u
OFNP	Walsall	17 + B		Apr 25, 2017	Sheet		S/A	- Type 2i - Type 2u
OFNP	Walsall	17 + F		May 2017*	Booklet	SAP168 SAP168	S/A	- Type 2i - Type 2u
2018 year code
OFNP	Walsall	18 + B		Feb 2018*	Booklet	SAP172 SAP172	S/A	- Type 2i - Type 2u
OFNP	Walsall	18 + F		Apr 2018*	Booklet	SAP168 SAP168	S/A	- Type 2i - Type 2u
OFNP	Walsall	18		May 23, 2018	Sheet		S/A	- Type 2i
2019 year code
OFNP	Walsall	19		Feb 2019*	Sheet		S/A	- Type 2i - Type 2u
OFNP	Walsall	19 + B	some 19B exhibit yellow phosphor	Mar 2019*	Sheet		S/A	- Type 2i - Type 2u
OFNP	Walsall	19 + F		Jul 2019*	Booklet	SAP168 SAP168	S/A	- Type 2u
2020 year code
OFNP	Walsall	20		May 2020*	Sheet		S/A	- Type 2i - Type 2u
OFNP	Walsall	20 + F		Aug 2020*	Booklet	SAP168 SAP168	S/A	- Type 2i
OFNP	Walsall	20 + B		Sep 2020*	Sheet		S/A	- Type 2i - Type 2u
2021 year code
OFNP	Walsall	21 + B		Jan 2021*	Sheet		S/A	- Type 2i - Type 2u
OFNP	Walsall	21		Feb 2021*	Sheet		S/A	- Type 2i - Type 2u
OFNP	Walsall	21 + F		Jul 5, 2021	Booklet	SAP168 SAP168	S/A	- Type 2i

* Issue date unknown.

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Booklet pane numbers used courtesy the Modern British Philatelic Circle
who publish 'The Bookmark' Catalogue