Lex, The Norton ledgers refer to prewar Department of Army Contract sales as "Green" and India Office as "Khaki" until the Army in their wisdom decided to name a greenish colour as "Khaki Green", after which the India bikes were referred to as "Matt Brown".
The stone colour seems to have been an RASC requirment for Palestine or Egypt. It doesn't seem to have applied to RAOC machines which were sent abroad in Bronze Green.