Showing fine ribbing and typical shallow whirls, an inked collector's number '293'. 316 grams, 10.7 cm



From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent.

Comprising twenty round-shaped geodes. 1.84 kg total, 40-56 mm



Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.