Watch List notes:

Commemorative Medals, Charles II, Restoration, so-called Pattern Broad, 1660, in silver, by Thomas Simon, crowned and draped bust r. (as used later on the Coronation medal), CAROLVS. II. DG ANG. SCO. FR. ET HI. REX, rev. crowned quartered shield of arms, date above, .MAGNA. OPERA. DOMINI., edge, plain, 30mm. 8.09gms (MI; 463/60; rev. as North 2776; Lessen, M., Simon's Mill Gold Coins and Medals of Charles II, 1660-1662, BNJ 65, 1995, type C), reverse extremely fine, obverse almost so, exceedingly rare
Lessen lists just three specimens: the British Museum; this – ex Spink auction 31, 12 October, 1983 (lot 299) and Montagu (828) = Murdoch (631) = Thorburn (293) = Vaughan Morgan 1935 (390) – this believed to be the specimen sold by Heritage auctions, 26 September, 2013 (lot 24844).
The Alan Irvine Collection of Historical and Artistic Medals (2000-2500 GBP)