Quote Originally Posted by 18 Wheeler View Post
Here's a thread from Garvin's excellent Vintage Diana forum, it has some nice photos for those like me who have never seen one of these.

It won't be long before he sees this thread and perhaps he can furnish you with an answer assuming the above is the correct article.

Someone else had the same problem... ATB
Yep--looks like the one in the 3rd photo down. I cant see anywhere that the filaments were attached to as there is no metal ring. Maybe it has been stripped and lost? Anyway, apart from shooting a bit low (on a diana 23) it actually seems pretty accurate just using it like a reflex sight and getting what you are shooting at in the middle of the lens.