Lancashire 20, Lancaster (Dalton & Hamer, page 65)

Denomination: halfpenny, scarcity: Fairly common
Dated 1791.

20. O: The point of crown under first limb of K. Very similar to last, O of IOHN
       clear of ermine to left. (Same as No. 19.)
    R: Line of shield just above E to right.
    E: PAYABLE AT THE WAREHOUSE OF THOS. WORSWICK & SONS . X .

On large and small flans.

No. 20, common.

The points noted as a mode of identification:
O: The position of the front point of crown to the letters of the word "GAUNT,"
   and the centre point of crown to the letters of the word "DUKE," also the
   star under bust.
R: The centre line of shield to the letters on either side, and point of shield
   to the date.

Keywords

iohn of gaunt duke of lancaster,lancaster halfpenny,1791

Additional photos

Image was provided by ebay seller druids_revenge and is used with permission. Please visit seller's shop; this specimen might still be for sale.