William and Mary 1689 Maundy Penny GVIELMVS error CGS UK 40

William and Mary (1688-94), silver Penny, 1689, conjoined busts right, withlegend continuous over bust, GVIELMVS spelling error with G of legend below busts, some stops absent, GVIELMVS ET. MARIA D G., rev. inverted die axis, crowned 1 of value, legend and date surrounding, MAG. BR. FR. ET. HIB. REX. ET. REGINA. (Bull 963 R5; ESC 2299 R5; S.3444). Toned with some streaks and flan adjustment marks, reverse struck off-centre and date not visible, a one year only type with obverse legend continuous over bust, the rarest variety with the spelling error, has been graded and slabbed by CGS UK as CGS 40, extremely rare.