The following was extracted from the Watson & Sons Illustrated Catalogue of Microscopes, 7th Edition, 1884.
JACKSON MODEL No.2 COMPOUND MICROSCOPE
Large size first-class Binocular Stand with sufficient range of coarse adjustment to focus a 4-in objective, lever fine adjustment, concentric rotating stage, divided to degrees, and with mechanical movements giving 1-in. of motion in each direction, sliding object holder and clamp, rack to eye-pieces to adjust to width of user's eyes, large double mirror on jointed arm, clamping bar for fixing the instrument at any angle, diaphragm fitting beneath the stage with wheel of stops. This instrument is of finest workmanship and finish with:
1 pair of eye-pieces : £13 13s.
A similar Instrument, but Monocular, with 1 eye-piece: £10 l0s.
A substage with vertical rack adjustment to focus, and rectangular adjustments for centering may be add to either of the above £2 28. extra.
Around 1882, after the death of the founder of the firm William Watson, the signatures found on instruments changed from Watson & Son to Watson & Sons. Evidently, this microscope was made before the change.