Norway Official Stamp 'OFF. SAK' Overprint

Norway · 1926 · 10 øre

This stamp is an official issue created by overprinting the definitive 'Posthorn' stamp with the text 'OFF. SAK'. The underlying design features the classic Norwegian posthorn emblem, a symbol of the country's postal service, crowned and surrounded by oak leaves. The overprint designated the stamp for use on official government correspondence.

Issued in 1926, this overprint was part of Norway's system for handling official mail, a common practice in many countries during this period to track and control government postage expenses.