Brass control knob
- PART OF:
- objective lenses and control knob
'Brass control knob, from 'Pathological set' of twelve objective lenses, by Cooke, Troughton & Simms Ltd., England, 1920-1939
'Brass control knob, from 'Pathological set' of twelve objective lenses, by Cooke, Troughton & Simms Ltd., England, 1920-1939