Middlesex 861, Spence's (Dalton & Hamer, page 177)

Denomination: halfpenny, scarcity: Fairly common
861.  O: A shepherd reclined under a tree. Ex.: 1790. Same obv. for 
         Nos. 859-861, as rev. of No. 690.
      R: Four men dancing round a pole, surmounted by a head radiated. TREE OF
         LIBERTY. As No. 797.
      E: SPENCE * DEALER * IN * COINS * LONDON *

861a. E: Plain. Also in brass.

No. 861, R. 861a, fairly common.

Keywords

1790,tree of liberty