Antique Coalport Demitasse Cup & Two Saucers - Black

From the research I’ve done looking at the stamps on the bottom of these, it appears that they were produced between 1875 and 1881. Beautiful gold interiors. Black you see on the bottoms in photos is mostly dust - the velvet backing of the display case is also old and flaking apart - I'll wipe these down gently before boxing! Will be sent bubble-wrapped and boxed. These are part of a larger set so please bundle for the best price.