Early ironstone egg separator - March 7th 1893 Patent mark

A rare antique white ironstone egg separator, marked with a black patent roundel for T.S Co. Boston, 7th March 1893. 
The early version of the Lightening egg separator with an unusual date, other early examples typically show 1891. The lightening egg beater later utilised black typography on the body and was filed under patent 3224 in the UK.
Dimensions:
10.1cm diameter
5cm tall
Condition:
Crazing and staining, otherwise perfect.