GB. GV 1912. ERROR! Control B12, ½d INVERTED Wmk  (die 2) block of 6.

Unmounted mint.

Watermark: INVERTED Multiple Cypher.

Perf type: 2A (the perforation holes extend beyond the base of the stamps to bottom of margin).

The space between the "B" and serif of the "1" is about 6.1mm.  

SG Spec. NB61a. in SG Specialist Catalogue vol 2. Regarding the Control B12, it states "the following watermark varieties are known", then lists Inverted Watermark.

There is tiny area of discolouration on a couple of perfs at the top of stamp R1C1 on the reverse side, but this does not detract from the appearance or scarcity of the item. The mark on the reverse of the middle stamp 2nd row is not a rust spot.

The white line on the forehead middle stamp top row is not a variety, but a reflection of the light in the photograph - I placed a clear mount over the block to keep it flat.

I have seen a similar item on the website of a prestigious GB specialist dealer (ex Strand) for £175. 

No thins, tears or perf splits.

Lovely colour.

Please review images for condition.






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