Pad lock

[wisconsinACE]

Got out before the rain came today. Not much but nails and other junk but I did find this cool padlock any idea on age?

 

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[PBK]

This "Belmont" brass lever padlock was made by the Eagle Lock Co. of Terryville, CT (c. 1854-1976).
At least some are marked "Pat'd Mar. 13, '08."

 

[junkdigger]

Here are two that sold on ebay in 1999. $32 and $34.50

 

[wisconsinACE]

Here are two that sold on ebay in 1999. $32 and $34.50

How would I go about cleaning it?