✅ SOLVED need help to identify

[historyrecover]

Has a crown on the back stamped best quality and three letters i cant make out. Just started doing a new home sige digging bricks at about 6 inches. Try get a date maybe some info thxs

 

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[nhbenz]

The three letters in question are R&S or K&S

 

[button king]

I would think 1820s-1840s I wouldn't think it would be any newer then that

 

[historyrecover]

Wondering if its 18th century

 

[Anduril]

If it helps, enhancing the image somewhat in PhotoShop Elements leads me to conclude that the rest of the text around the edge says "BEST QUALITY".