A unique number identifying an object or specimens, including any separated parts.
How to record
The following points should be considered when assigning an Object number:
Only use a single number to describe a group of objects if they are too numerous to number individually and either contained in a single container or separately accounted for, eg a box of sherds or an archaeological archive
Do not include in the number any classificatory components as these may change
Avoid alphabetical components
Assign a unique Object number to each separated or separable part of an object.