gold for iron

This iron ring from Bell and Bird caught my eye. From the item description:
Rare iron ring, circa 1914.

"Gold gab ich fur eisen" translates to "I gave gold for iron." It is a patriotic symbol and a piece of social history. A woman would have given her gold wedding band and been given this iron ring in exchange ... Iron and Steel jewelry first came into fashion in the 18th century. Specifically, iron jewelry in Germany when the treasury was strained by the fight against Napoleon. That was the origin of the patriotic movement to give gold for iron. With the outbreak of the first world war in 1914, the effort to increase the treasury was reinstated.
Also: a poppy from Flanders Field, pressed in the pages of a WWI soldier's Bible.