Image: OS Benchmark St Cosmas and St Damians
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Description: An OS Bolt Benchmark. The lead insert has a horizontal incision defining the Height ASL more accurately that regular BMs.
Title: OS Benchmark St Cosmas and St Damians
Credit: Own work
Author: Herr Rott
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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