Very unusual Brass Clarke Combination Padlock with hinged lid and a sliding door on back side. Door is marked Baltimore Md. Clarke Combination Lock Co. pat'd Feb 4, 1873 June 15, 1875 and reissued Feb. 29, 1876. Nice tight lock, I do not have the combination but the lock remains unlocked, the size is 4" x 2-5/16" x 11/16" not measuring the lid. Very unusual lock dated just after the civil war. - Found on eBay
The starting bid is $499.99 and you can buy it immediately for $750. that sounds a bit high to me, but then again, these don't come up for bid everyday.
Update: This lock sold for $499.99 (Plus $5.30 in shipping).