Charles I pattern heavy weight gold Unite, Unique 30 shilling weight NGC AU55

Charles I (1625-49), pattern gold Unite of Thirty Shillings weight, struck in high relief by Abraham Van Der Dort, long haired bust left in lace collar, no mark of value but gold equivalent of Thirty Shillings, initial mark lis with stop either side, Latin legend and toothed border surrounding, CAROLVS. D; G; MAG; BRIT; FR; ET. HI; REX, rev. struck en medaille, crowned oval quartered shield of arms, crowned C to left, crowned R to right, initial mark lis at end of legend (c. 1630), Latin legend and toothed border surrounding, FLORENT. CONCORDIA. REGNA., edge plain, weight 13.89g (cf.WR 22 R5; Farquhar, British Numismatic Journal, first series, volume 5, 1908, page 178 this coin illustrated, N.2655). Graded by NGC AU55. Light wear to highest points only, light red tone, small rim abrasion, the only known specimen of this weight for thirty shillings worth of gold, perhaps unique as it is the only known example to us.