I remember the Model 1900 Haenel bolt handle as the owner contacted me about it.

A PO, probably a long time ago as in original owner, wanted this bolt handle extension for some reason. This bolt handle will swing down giving a lever about twice as long as the original. Perhaps the PO had some strength issue in the right hand/arm and needed the extra leverage to open the bolt.

We will never know why this was sone but somebody had what they thought was a good reason.

Vlad