Middlesex 1100, Spence's (Dalton & Hamer, page 201)

Denomination: farthing, scarcity: Rare (R)
1100. O: A man on all fours. IF THE LAW REQUIRES IT WE WILL WALK THUS.
         Same obv. for Nos. 1099-1105.
      R: A man riding on a bull with an ass's head. AM I NOT THINE ASS. 
         As No. 1078.

No. 1100, R.

Keywords

if the law requires it we will walk thus,am i not thine ass