Shown mark was registered to (and used by) the company of [i]Reinhold Schlegelmilch[/i] which had its main factory in the city of Suhl (Thuringia, Germany) and also owned a subsidiary in the town of Tillowitz (Silesia).

Shown mark was introduced 1912; it is either found solo (like yours) or with an additional ‘[i]RS Prussia[/i]’ or ‘[i]RS Germany[/i]’ mark. Items marked with the ‘[i]Friedrich II[/i]’ mark were not intended for the US market but rather targeted towards the UK, Australia, Canada and New Zealand.

——-
I generally never comment on value, for various reasons.