Watch List notes:

MS63 | Elizabeth I (1558-1603), Third 'Restoration' Coinage, Sixth Issue [Fine Gold], Angel [of 10 Shillings], (Pyx Period: 1 February - 29 November 1583), Tower, (m.m.) ELIZABETH : D '. G '. ANG .' FR .' ET : HI ' REGINA, St. Michael vanquishing Dragon, rev. (m.m.) A : DNO : FACTVM : EST : ISTVD : ET : EST : MIRABI '. Ship sailing left, surmounted by square-topped shield and crucifix mast dividing E and Rose, twisted rigging 3/2, without bowsprit, waves lapping below, 5.05g [78.0grns], 6h, m.m. bell [over sword ?] (HCN 105; Montagu Duplicates II, 132; Murdoch I, 609; Lockett 1963 this coin; cf. Comber II, 122; Schneider I, 786; Brown & Comber C25; North 2005; Spink 2531), a bright coin with a superficial marks to Angel's left wing and on Dragon's body, a mysterious doodled privy mark 'bell' beside the official pyx mark on reverse, otherwise on a broad and neat round flan, very fine, the central devices better still, rare, in NGC 'Horace Hird' holder, graded MS63 (Cert. #6135299-005).
Provenance
A Lost Parcel from the Celebrated Horace Hird Collection
R C Lockett, Part II, Glendining, 11-17 October 1956, lot 1963 - very fine, rare - £14.0.0
, ,
Brown and Comber record twenty instances of this privy mark for denomination [not accounting for duplication] as listed in the Spink Numismatic Circular and Seaby Bulletin between 1937 and 1983. Challis records the mint output for this Pyx Period at £34,977.

Estimate: £2000 - £3000