Need ID help with colonial button or seal found today

[Bill D. (VA)]

This small lead or pewter item appears to be a button, but with the markings it might be a seal. It contains 3 rows of lettering: GROS-MAR-MAH, or that's what it looks like. Any clue as to what this is or what the markings mean?

 

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[Woodland Detectors]

Nice cloth seal Bill.

http://www.finds.org.uk/database/se.../cloth+seal/broadperiod/POST+MEDIEVAL/page/14

http://www.colchestertreasurehunting.co.uk/baleseals.htm

I'm pretty sure it has to with quantity, weight, maker etc..