This underprint is for the firm James Spicer & Co. (later James Spicer and Sons). They were wholesale Stationers and Paper Merchants.
They operated from:
68 Upper Thames Street,
1868. Unofficial underprint in black over the gum.
PP178 1/2d rose-red (SG 48 or G3)
Multiples of this underprint are very rare and so far I have located just one example from plate 11.
PP179 1d lake-red (SG 43 or G1)