Shield Mintmark" ​​​Imitation, Hereford -

"Shield Mintmark" ​​​Imitation of Richard of Hereford   

Obv: Note the unusual initial mark, having a shield above the central fleur.  Pointed chin, oval eyes, thick crownband. No necklines.  Rev: RIC/ARD/ONh/ERE - AR,NH & ER ligated.
Note that each quadrant has only a single pellet rather than the usual three.  This coin was sold in the Morton and Eden auction on Dec 7th, 2017.  Lot #92.  It was described in the auction catalogue as...

 *Imitation: Westphalia, Heinrich der Bogener von Oldenburg-Wildeshausen (1233-1270), sterling, attributed to Vlotho, near Herford; a close imitation of a Henry III Class 3b penny but with a single pellet in each angle of reverse, obv., triangular mintmark and legend hENRICVS REX III, facing bust, rev., voided long cross, legend with several ligated letters RIOARD ON hERE, 0.99g (see P. Berghaus, Waerungsgrenzen des Westfaelischen Oberweser-Gebietes im Spaetmittelalter, p 6, and P. Berghaus, Muenzgeschichte Herfords, 1971, pl. 18), very fine, extremely rare 

It is interesting that the coin has been related to Herford, which is located to the NW of Lemgo and Detmold, two other locations associated with H3 imitations; however the attribution may be wrong, and that the coin really does imitate the English town of Hereford.