From the 1928 British Journal Photographic Almanac, whether the unit of volume is UK or US isn't given.

Eastman Kodak Research Fine Gran Developer 1927


For Fine grain. - A developer recommended by the Eastman Kodak Research Laboratories for use when images of specially fine grain are required is as follows:-

Metol . . . . . . . . . . . . . . . . . . 8 gr (2g)
Sodium Sulphite (anhyd) . . . . . . 400gr (100g)
Borax . . . . . . . . . . . . . . . . . . 8 gr (2g)
Water to . . . . . . . . . . . . . . . . 14 ozs *** (If US oz 1600ml - UK 1540ml)

The developer works more slowly than those of normal formula. - A.P., May 25, p. 504.

This seems to be one of the earliest published Fine Grain developer from Kodak.

It's far more likely that the volume is US, particulary as the formula eminates from Rochestwe not Kodak Research, Harrow, but the difference is quite negligible. This formula pre-dates D76 and is quite similar to D103 and DK76 & DK76b, although more dilute.

D103

Metol . . . . . . . . . . . . . . . . . . 2g
Sodium Sulphite (anhyd) . . . . . . 100g
Borax . . . . . . . . . . . . . . . . . . 1g
Water to . . . . . . . . . . . . . . . . 1 litre

Ian