
Nocturne in Grey and Gold: Chelsea Fish Shop may have dated from 1885, and certainly before its first exhibition in 1886. 1
Alan Summerly Cole (1846-1934) noted in his diary on 26 November 1885 that Whistler was 'Doing new work by painting at night for night effects', which may have included this painting. 2
Most of Whistler's Nocturnes date from the 1870s, including Chelsea subjects such as Nocturne: Grey and Gold - Chelsea Snow y174 and Nocturne: Trafalgar Square - Snow y173. Although Whistler painted a few Nocturnes in the 1880s, including Nocturne in Blue and Silver: The Lagoon,Venice y212 and Nocturne: Blue and Gold - St Mark's, Venice y213 in Italy; and three in London (Nocturne: Chelsea y235, Nocturne: Silver and Opal - Chelsea y309, and Orange Woman y310), no others are known to have been painted as late as 1885.

Nocturne in Grey and Gold: Chelsea Fish Shop, Whereabouts unknown

Street in Old Chelsea, Boston Museum of Fine Arts
Only one title has been suggested:
'Nocturne in Grey and Gold: Chelsea Fish Shop' is the preferred form of the title.
The Saturday Review on 22 May 1886 described it as 'a supposed rendering of lights on a foggy night.' The description in the Magazine of Art suggests the colour was basically brown but does not otherwise help to identify it: 'The dark brown fog ... though it ... represents nothing, sounds as it were, the fundamental bass of the chord in a low octave.' 5
Chelsea, London, UK.

Street in Old Chelsea, Boston Museum of Fine Arts
Maunder's Fish shop in Chelsea – which could have been the subject – appears in several of Whistler's prints and paintings including Street in Old Chelsea y249.
The art critic of the Saturday Review on 22 May 1886 criticized 'the sketchiness of manner which is used with such judgement and true effect in other instances.' 6
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The price was estimated by Dowdeswell at £50 but this was doubled by Whistler to £100, so he obviously thought highly of it. 7 It was described in the Saturday Review on 22 May 1886 as 'a supposed rendering of lights on a foggy night, [which] unfortunately prejudices people against the sketchiness of manner which is used with such judgement and true effect in other instances.' 8 It received a marginally more appreciative comment in the Dundee Evening Telegraph on 27 May 1886:
'Mr Whistler has been undervalued a little too much. He can draw and he can paint when he likes; and in that case he may surely describe a girl with crimson cap as" a note in flesh-colour and red", or Chelsea fish-shop as "a nocturne in grey and gold", if it pleases him to do so.'
1: YMSM 1980 [more] (cat. no. 336).
2: Ms Copy, GUW #03432.
3: 'Notes' - 'Harmonies' - 'Nocturnes', Second Series, Messrs Dowdeswell, London, 1886 (cat. no. 65).
4: YMSM 1980 [more] (cat. no. 336).
5: Magazine of Art May 1886 [more], at p. xxxi.
6: Press cutting in GUL Whistler PC 8, p. 8.
7: Annotated catalogue, GUL Whistler EC 1886.
8: Press cutting in GUL Whistler PC 8, p. 8.