Watch List notes:

(g) The St. Albans Collection of English Gold Coins | NGC UNC Details | George III (1760-1820), 'Garter' Half-Guinea, 1811, seventh laureate head right, nose to G of GRATIA, rev. Garter shield, edge obliquely milled, 4.20g, 11h (MCE 447; EGC 857 [R4]; Selig -; Stratos 49; Spink 3737), softer details to hair and tiny graffiti marks in fields, otherwise brilliant, much as issued, the key date of series, rare thus, with NGC 'St Albans' Certification, harshly graded UNC Details ~ Obverse Scratched (# 6295553-040).
Provenance
'A Distinguished Collection', purchased en bloc via Spink, August 2018,
Spink, by private treaty, 3 February 2012 - [SPK4224/4] - £900,
From a private collection on the Isle of Man
Estimate: £800 - £1200