Middlesex 503, Skidmore's (Dalton & Hamer, page 151)

503.  O: Two men at a forge. MANUFACTORY . & . IRON-FOUNDRY . CLERKENWELL *
         Ex.: 1795. Same for Nos. 494-509, as rev. of No. 480.
      R: A cypher W G M, &c.
      E: Milled.

Nos. 480a-519, are with few exceptions exceedingly rare.

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