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This Dutch Bible with minervahead M for Schoonhoven is marked, but very hard to recognize the hallmark. So some help is appreciated!

Year letter Gothic C for 1862, your image of year letter is upside down. Minerva Head with the regional assay office letter M for Schoonhoven. Lion passant above 2, 2nd standard silver 833/1000.
The maker's mark

Perhaps AD 81 in square for Jacobus van Dam, started 22-5-1849, stopped 1888. His brother Huig van Dam worked for him as a servant and engraver as of 1-5-1873. Jacobus van Dam made small silver work, including silver (bible) locks, miniatures and  boxes. He also traveled with his work to other market places.

Peter.


Source; Zilversmeden van de Stad Schoonhoven by S. A. C Begeer, E. Hak & L. Linhart-du Cloux

Thanks Peter!