Shaw Munster maker's mark
SM on the slider could be maker Shaw Munster, producing for more than 150 Years and still active:
https://shawmunstergroup.co.uk
Tim
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"Manui dat cognitio vires - Knowledge gives strength to the arm"
"Better to know it but not need it than to need it and not know it!"
"Have more than thou showest, speak less than thou knowest."
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