Watch List notes:

(g) Victoria (1837-1901), Sovereign, 1891, London, 'Jubilee' bust left, angled J. E. B., rev. St George and Dragon, horse with 'short tail', edge milled 7.94g, 12h (DISH L14 [R5]; Schneider II, 655/-; Marsh 129; Spink 3866B), lightly cleaned and rubbed, otherwise fine, extremely rare.
Provenance
From the Quinn Collection
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NGC XF40 (Certification #5879377-010)
, https://www.ngccoin.com/certlookup/5879377-010/40/
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The recent Dave Iverson Study on Jubilee Head Coinage 1887-1893, noted: 'A very hard coin to find, only a tiny fraction of this year's production were produced using a short tail reverse die. The very few examples found now are almost always lower grade.' The study ascribed the rarity rating R5 (5-10 known)

Estimate: £300 - £400