level Height: 17.5 cm level Width: 38.5 cm level Depth: 16 cm Box Height: 17.5 cm box Width: 41 cm box Depth: 22.5 cm
[nb-NO]Documentation[nb-NO]
Side 1 - No 8850 ERW&S in prism; Side 2 - E R WATTS & SON LONDON; Side 3 PATENT NOS: 17944-1910, 18119-1910; 25622-1910; 33337-1920; PROV PAT 24154-1922.