The comma is easily explainable – dust filter.
What’s even more odd than the comma is the recent transaction history.
Card is sold by Probstein for $3549 on 9/17/13
http://www.ebay.com/itm/T206-Walter-...ht_1086wt_1042
Card appears in Memory Lane, but never sells (Frank, I don’t think your link is actually a “sold” item). Card fails to sell at Memory Lane on 9/2/14 with a BIN of $3250. This is what I find most odd – why would Memory Lane list the card at $3250 when it just when it just sold by Probstein for $3549?
http://cgi.ebay.com/ws/eBayISAPI.dll...ht_1755wt_1171
About two weeks later, the card re-appears in Probstein’s auction this time selling for $4733
http://www.ebay.com/itm/T206-Walter-...ht_1074wt_1042