Pretty confident that this is NOS or has had very little use study photos. As no wear where the pin goes through 
Believe it’s to suit FX models not sure of the difference just what has been written on the tag

B01C312210
Due to the US Tariffs I?m finding it uneconomical to send to the USA unless I get the buyer to pay the Tariff please message if interested in any of my items if you are based in the US.