WW1 Spare Gun Cart tag

Thought this item did not exist,as no one had ever seen one before. There is no documentation that there was a separate brass tag for the Spare Gun cart. It was assumed that the spare gun cart was simply tagged as a gun cart. Even the experts had never heard of this tag before...until it surfaced in an ebay sale recently. It also has the lowest number ever seen for the 1917 Machine Gun Cart series...#286. If anyone has one of these tags for sale...gun cart,ammo cart or especially the spare gun cart....I'd be VERY interested in it for the restoration of these carts. I consider this to be an historical find only second in importance to my finding the 3-carts-in-the-crates last year. Hope you'se guys enjoy seeing a one-of-a-kind item from WW1 that may never be found again. Just hope I'm wrong....LOL....