CPRR Lock

From: "John Sweat" john-molly@sbcglobal.net

Yesterday while fishing along the Truckee river I found a railroad lock. On the back it has the CPRR CO. Stamp marks and 4 87 stampings, which I guess would be the month and year of manufacture. On the latch the capital letter G is stamped, do you know what this means? Also could you tell me roughly the value of this lock.

—John Sweat

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At the top is stamped: 4          8    7
The numerals above are separated about like I typed them here (about an inch total spread). On the horizontal rectangular plate is stamped:
C. P. R. R. Co.
Color looks ... like real life! You can see the verdigris.

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The key opening cover swivels from the top to open, exposing the opening for the key (skeleton type). Opening is about 5/8 inch high with circular pin at top.

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