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Comment by john6553 on November 28, 2012 at 14:13

Here is additional information about this knife. It was shared by a knife maker in Italy who knew the maker of this knife.

The Trap Door you have is very very rare because only a few pieces were made with the spring wire that keeps the door up. I only have seen 3 pieces of this model. Two I sent in US an one is in my collection.
These knives was made in Maniago in the 60's by Rosa Uliana Primo and brother. He made 3 models: one cow horn handled (whit and without spring wire) with trap door on the right, one aluminium handled with trap door on the left and one black plastic handled without trap door with double gravity action. This last one is also rare. Untill some years ago these knives were very very rare but 6 years ago I found the old stock in a factory warehouse that had the exclusive but sold only a few pieces so in these last years I have sent in US about 50/60 pieces some in horn and some in aluminium.