>> they were by no means used in farming<<
I have some historical items in my office, like an original 1913 Form 1040 and a 1970's Kleinrock guide. I don't actually use them in tax preparation as such, but I still consider them to be appropriately classified as business assets.
But my wife is not a tax preparer, so when I go her only interest in such collectibles will be in how much she can sell them for as an investment. In my state she gets a full basis step-up that eliminates any depreciation recapture.