Maybe a bit outside the question in context, but this one paralells the Wagner in a few ways. Withdrawn from sale, probably due to poor printing quality, but the other story is that McKinleys widow didn't like it. Only one box of 500 was shipped by mistake, to a company that operated garbage barges for NYC, so an iffy link to 52Topps High numbers too. All were printed with an address and info for the tugboat operator to fill out. Unaddressed ones were actually specimens that got out. Not quite as expensive, but still pretty pricy for a plain postcard. (Sorry for the long link)
Steve B
https://www.siegelauctions.com/lot_g...calledfrom=lkp