1968 4d Christmas Rembrandt MISSING PHOSPHOR

1968 SG 775y 4d Christmas REMBRANDT Print MISSING PHOSPHOR. smooth grey boys jumper, high set Queens head. cat £5 …

2d Green AOP Sideways wmk

another Dollis hill trial stamp, utilisimg sideways left watermarked paper, this 2d has Green all over phosphor. unmount…

2d No Watermark

1970, as part of the Post Office trials to test the durability of phosphor, residual stamps were used is various experim…

2d Swy right AOP F/U

a Dollis Hill PO trial into phosphor durability shows a 2d using Sideways right wmk (not otherwise seen on 2d) with Gree…

3d C/B plus Violet All Over Phosphor

3d Wilding Error/Trial Centre band violet Phosphor with full All Over Phosphor, Unmounter Mint, upright Wmk

3d No Wmk AOP Fine Used

a Dollis Hill Phosphor trial No Watermark and All Over Green Phosphor this copy is 'used'. Cancelled by PO to test durab…

3d unwatermarked, marginal

Part of the 'Dollis Hill' Post offoce trials into phosphor, using remainder stocks. This marginal single is on thick Unw…

3d Wilding All Over Phosphor, sideways wmk

a 'Dollis Hill' PO trial stamp into phosphor, this example has GREEN all over phosphor and is sideways right.. The stamp…