Antique Ritchie Patent Combination Square and Bevel. 1884. Vintage Rare. For Sale

This is a very rare combination square and bevel with a patent of 1884. There are two versions I’m told, one that’s brass and one that’s german silver and I’m told by a collector that this is the rarer german silver version. I got this from a prolific collector and it looks like he started to fix this up but didn’t finish. It’s totally usable however the glass bubble level in the circle is missing so that will need to be replaced. Other than that it seems to work.