Physical description

No. of pieces: 12 Mold, cut, screw, plated, polish. Accessories: 11 detachable screw knobs. Surface finish: varnish, electroplated.

Inscriptions & markings

Inscribed on top face: “1 MEGOHM/ PATT.948 GAMBREE BROS & Co LTD LONDON. No 120” Chipped paint dot on top face in the front right corner.