The Notting Steel Quoin

Hello all,
I found one of these devices in my latest scrap buy. Is it still useful? Thanks

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The Notting is a good style of quoin, and if you already have Wickersham quoins (or Cornerstone or several others) it uses the same key.

Nottings are fine, but I would’t touch a Wickersham with a barge pole! Cefmor were Ok too