CNR Vintage Working Padlock and Key

A vintage piece of Canadian history!  This is a serious lock, weighing in at just under a pound, made by The Robert Mitchell Co. Limited.  Lock is stamped CNR.

Key is stamped C.N.R. on one side, R.M. Co. (The Robert Mitchell Co. Limited) and S on the other side.

Dimensions: 3" wide x 3" 3/4" high from the base to the top of the shackle. Chain is 17" 3/4" long.  Weight - 442 grams.