155 TB

This is an important stamp as it shows the S&S 5 perf variety. This is found on plates 155, 173, 176, 184-193 (see MW's comments Mulready Plating 24Feb2013). 190-3 were put to press 10/11Aug1854 and 155 was defaced 24Aug1854 which gives a two week window for this stamp to have been plated. However there is a question mark here. This stamp does not match any plate within the range for the perf fault except 1)155 and 2) possibly 193 which is a missing imp. This could be 193. Also appears to have the chin flaw of 200/201, but these were engraved in November??