William III, proof Halfcrown
1697B Bristol. Awesome Coin
struck on a beautifull polished flan, laureate and draped bust right,
the B below a wonderfull example of a provisional issue,
rev. larger shields, an equal reverse field, Jeffrey Hearn commented
a rarity not appreciated :) 40 years ago
Extremely rare one or two known. edit dguest@spink.com

William & Mary. Halfcrown, 1690, Silver  

GRETIA error instead of GRATIA, second V over S in GVLIELMVS
edge, upright .*..DECUS.ET.TVTAMEN..ANNO.REGNI.SECVNDO 
extremely rare, finest known speciman of this rareity.
The end of a die that was used until the end. The year 1690 is rare without
the errors. In the last 50 years I have traced 7 specimans of 1690. Three specimans
were in the Colin Adams Collection 2005. edit dguest@spink.com  

Who is the artist and what period 
could it be?
Please write to info@petitioncrown.com

   
1494 GROAT [4d.] Silver
A British Rarity
Perkin Warbeck pretender to the English throne,
(1474 – executed 23 November  1499)
1494, m.m. lion, crowned arms with crowned lis and rose at sides, within tressure, domine salvvm fac regem, rev., crown above lis and lion, rose below, within tressure, mani teckel phares 1494, double saltire stops (N.1758; MI.21/3), struck on a small flan (as usual), an excellent example, near extra fine, extremely rare 
Perkin Warbeck, claiming to be Richard, Duke of York, the brother of Edward V, tried to invade England three times. He was finally captured near London and was executed in 1499.
These extremely rare pieces, of which around 12 examples are known, are believed to emanate from the Burgundian Low Countries. They carry the royal arms of England and, although anonymous, have generally been accepted as being associated with Warbeck. The date, 1494, the legend, on one side a version of the writing on the wall at Belshazzar's feast (seemingly a threat to Henry VII) and on the other the Latin equivalent of 'O God, save the King' (a reference to the pretender) and the general resemblance of the obverse to a description of a seal of Warbeck's strengthen the attribution.
The average weight of the extant examples is around 60 grains, in contrast to the 48 grain standard for the contemporary English groat, and the existence of only one pair of dies suggest that they were not a serious exercise in finance, but they may well have been struck in the run up to Warbeck's 'invasion' of England in July 1495.
Curiously the specimen in the Fitzwilliam Museum was bequeathed to Cambridge University as long ago as 1589 (C E Blunt, BNJ 1950 pp.215-6) 

  
Henry VIII, third coinage, Silver
Testoon [Shilling, 12d.]
Henry VIII, third coinage, 7.67g., Tower, m.m. lis, group A, bust 1, crowned bearded bust of king facing, with prominent sidelocks, wearing mantle with collar of fur, henric viii di gra agl fra z hib rex, rev., large crowned rose, crowned h r at sides, posvi devm adivtorivm mevm, lombardic lettering, Roman m, saltire/double saltire stops, two double saltires after mevm (Jacob O.1/R.1 ; N.1841; S.2364), a beautiful specimen, on an exceptionally full round flan, the detail fully clear and struck up, extremely fine, excessively rare in this condition 
provenance: S Tyssen, Sotheby, 12 April 1802, lot 1707 (2 in lot) Lieut. Col. W Durrant, Sotheby, 19 April 1847, lot 379 Rev. E J Shepherd, Sotheby, 22 July 1885, lot 218 £32-10-0 ('a remarkably fine specimen of this scarce piece') S Rostron, Sotheby, 16 May 1892, lot 119 £35-0-0 ('in matchless condition, and of great rarity in this state, said to be the finest known') J G Murdoch, Sotheby, 31 March 1903, lot 443 £40-10-0 Spink Numismatic Circular, July 1942, no.15406 £45-0-0 The first testoons of Henry VIII, the 9 oz fine issue reading henric VIII, are struck in finer metal but in lower relief than the subsequent issues. They are rare in absolute terms and extremely so in a high state of preservation. This example has long been regarded as unrivaled. It may be compared with the Shuttlewood example (Spink Auction 151, lot 155, from the same obverse die also from the Murdoch sale (lot 444 £12-0-0)), itself one of the finest known. In his annotated copy of the splendid 1892 Rostron catalogue J S Henderson notes against lots 119 & 120 (a base silver 'Holbein portrait' testoon which realised £11-0-0) 'These shillings are quite matchless as to condition in any collection; 119 was bought for Mr Murdoch; 120 for me; they are both now in my possession' J.S.H. Henderson bequeathed his collection to the Fitzwilliam Museum, Cambridge in 1933 but while the acquisition catalogue lists Rostron lot 120 does not include Rostron lot 119. If Henderson purchased this coin at the Murdoch sale but subsequently parted with it, it would explain most of the long gap in the provenance between 1903 and the Spink Numismatic Circular listing in 1942.