2913.8b 2nd Large M18L Walsall dull blue phos 3rd printing

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Great Britain
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2nd class Large blue Machin security stamp 2018 counter sheet M18L

The 2nd class Large letter stamp from was reprinted on 14/02/18 by ISP Walsall.  In this printing the phosphor reacts with a blue glow under ultra-violet light.

A third printing was made on 29/10/18 which has phosphor glowing dull blue, with no yellow fluorescence

See photo comparison, Left to right
- 2nd printing, dull blue phosphor, yellow fluorescence
- 1st printing, bright yellow-ish blue phosphor
- 3rd printing, dull blue phosphor only

SG U3000 (previously U2959, also used for previous years)

Formats available
: (if your choice is out of stock please ask - blocks expected soon)

Singles & multiples
Cylinder blocks of 6
Date blocks of 8 - 29/10/18

£1.30 inc. tax

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