Victoria 1850 Sovereign, 8 with 5 struck over it, Ex Bentley lot 986, extremely rare

Victoria (1837-1901), gold Sovereign, 1850, the 8 of date with 5 struck over it, second larger young filleted head left, W.W. raised on truncation for engraver William Wyon, date below with unusual overstrike, Latin legend and toothed border surrounding, VICTORIA DEI GRATIA, rev. crowned quartered shield of arms, laurel wreath surrounding, emblems below, Latin legend and toothed border surrounding, BRITANNIARUM REGINA FID: DEF: weight 7.97g (Bentley 986 this coin; Marsh 33B R5; S.3852C). Once cleaned, but now lightly toned, some surface marks and nicks, otherwise good very fine and still the only example the cataloguer has seen of this elusive and clear overdate, extremely rare.