A cap that covers the Elmar 50mm f3.5 with a 36mm diameter filter attached.
This item is made of brass with black paint and features velvet on the back. It is quite hard to find.
Considering it has been over 90 years since its manufacture, it is in remarkably good condition.
There is minor deterioration of the paint due to aging, but there is almost no noticeable wear from use. The velvet on the back is also in beautiful condition.
Tested for fit on an A36 lens.