I wouldn't trust an Ebay seller to say this is a "Sherman Tank" wrench without other supporting evidence. It may be but sellers can say anything and usually will to make a sale.
I was in the gun store one day and looking at an old banged up but looked workable Colt 1911. The gun store owner told me "We were told this gun used to belong to 'Wild Bill' Donovan." Right. An old adage for gun nuts is, Don't buy the story, buy the gun. Without documentation it was a $600 gun. If they did have documentation it would be worth twice what they were asking, or more. They were asking $5,000.
