Biscuit porcelain crystal models

unsigned [John Joseph Griffin], England, ca. 1841
Collection of 24 cream colored biscuit porcelain crystal models (size ranging from 3 to 10 cm) in contemporary (but probably not original) mahogany case. Each has faces stamped P, M and T and most models are identified in manuscript on paper labels.
The models are not signed, but the material they are made of and the stamped letters P, M, T are typical for models made by John Joseph Griffin (ca. 1841).

Reference:
Griffin, John Joseph (1841) A system of crystallography: with its application to mineralogy, Glasgow

private collection