9543

E.R. Watts & Son (Maker)

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1920 - 1925

Wood, canvas

E R WATTS & SON / LONDON / ERW&S in prismscale numbered from 1 to 10 in red, 13V 7 N in between in black. The centre is marked in 1/50ths of a foot in black. RHS carries two red digits of the corresponding foot to assist readings.