Any way to date this lock

[Mark1985]

Dug this lock and lock plate the other day in my civil war site is there any way to date it by the fob ?

 

[hunting deer]

http://www.treasurenet.com/forums/what/399306-antique-padlock-plz-identify.html I found one earlier this year like yours except it had a crown symbol on the keyhole cover. I found this link from an earlier find this year on T-Net.