Unusual armillary inkstand probably Russian from Tula

A very unusual and rare inkstand in ormolu representing an armillary sphere opening in two parts, and revealing interior compartments, standing on a circular pedestal base. This inkwell has its original ormolu and is from the neo-classic period. Probably made by the Russian manufacture of Tula. A similar inkwell is in the Hermitage museum.
Circa :1770
Dim: w: 4.3 in - d: 4.3in - h: 8.3in.
Dim: L:11cm, P:11cm, h:21 cm.