Identifying an unknown, probably Austrian hanger

[Madnumforce]

Hello Fernando and Benoît,

First, sorry for not having used the proper procedure for posting pictures. This will not happen in the future.

Second, thank you very much for the identification! But Searching on the web for the difference between the 1836 and 1851 pattern I don't see much at first glance. Does the book give any precision on that regard?