This is an absolutely top notch signal box lock and wrench style key set. Both pieces are marked L&N for the Louisville & Nashville Railroad, which used locks like these to prevent tampering and vandalism of signal boxes that were mounted along railroad tracks.
Both pieces are solid brass, extremely clean and well made. The lock is marked WRRS for Western Railway Supply Company. We cannot find any damage, and they work perfectly together.
As collectors know, the 6-sided pin in the lock is difficult to find. The Triangle shape is much commoner.
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RR Marked Louisville & Nashville Railroad Brass Signal Box Lock & Key Hexagon 6-Sided Set