Please anyone identify this hallmark

Can anyone identify this hallmark?

Can you please give some context. What is the object it is on? A photo of the object often helps identify period and place. Thanks

It’s on the back of a brooch.

From the sword with the 835 it is most likely Dutch from no earlier than 1953. Try this link Dutch Hallmarks - Encyclopedia of Silver Marks, Hallmarks & Makers’ Marks.
A second source for the sword is this link THE NETHERLANDS SILVER AND GOLD HALLMARKS (1953 TO PRESENT)
As for the HR this is most likely H.F.M. Rogier (Artis Causa Co,) 1978 see this link THE NETHERLANDS SILVER MAKER’S MARKS FROM 1814
The shield I’m puzzled. It is rather indistinct looks like quadrants with an “M”. Happy researching

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Thank you so much for your help!

The shield - four lions (City of Schoonhoven) and letter “M” inside.

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Wow, thank you so much, I really appreciate it!

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U welcome! ___

Anyone familiar with this type of stone? I’ve been racking my brain. I think it may be gold obsidian, but really don’t have a clue.