1638-9 Charles I Tower Mint mm Anchor Shilling CHRISTO ERROR

Charles I (1625-1649), Tower mint under the King (1625 - 42), Shilling, Group F, type 4.3, mm. upright anchor (S 2796; N.2229; Sharp F3/1; SCBI Brooker -; ) weight 5.76 grams 

I over R in CHRISTO in error, the portrait clear and well defined. About VF.