This is a large/heavy brass antique padlock manufactured in the 19th Century by EDWIN COTTERILL of Birmingham, England. The lock comes with it's original key and spare. The lock is in perfect working order and can be both locked and unlocked by both keys, which are still a good fit, with little free play. There is minimal free play in the hasp.
This particular example was known as the CLIMAX DETECTOR and was warranted at the time to be both Power Proof and Unpickable.
The brass casing is clearly marked with the maker's name, as are the hasp and both keys. One key still has it's original protective brass sheath. The padlock still has it's original sliding escutcheon, which I understand is often missing.
The padlock measures just over 5" (13cm) from top of the hasp to the bottom of the casing, which is 3" (7.6cm) wide and maximum 1 3/4" (4.5cm) thick. The lock with both keys weighs almost 1.2kgs, so is surprisingly heavy. - eBay (23 April 2013)
This padlock had a high bid of 1,505 British Pounds / $2,331.40 (Plus 28 Pounds Shipping).