This is a rare Armorer's Kit for servicing the Swiss ZFK55, the sniper variant of the Swiss K31 rifle. This kit's full contents can be viewed in the above product photos.
The main roll is in beautiful condition with a metal plate indicating the kit's use for the ZFK31/55, both in German (Zielfernrohr-Karabiner 55) and French (Mousqueton à lunette 55). The inner leather has a cartouche from the inspector (cartouche with Swiss cross and letter R) as well as the year of 1950, "H. AEBERHARD" from Grosshöchstetten in the Canton of Bern.
The inner leather pouch containing all of the small parts is stamped with the Swiss shield and has the manufacturer's stamp, "BERTOLINI GIUSEPPE" in Vira-Gambarogno, located in Canton of Ticino.