I found this gem on eBay about a year and half ago for $6. Right now on eBay, there is at least one that I saw in similar condition for buy it now $99.99. Clearly, the seller didn’t know what they had- it was buy it now and the description was vague, the picture not so clear. But I took a gamble and it was a good one! This Clapsaddle card published by Wolf was mailed October 30, 1917. It is part of series 501, and is the only card from that series I have.