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TOOL INSTRUMENT No256 GPO TOOL, 1933
Unknown device used by the GPO.
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- The markings are GPO standard coding.
SG means G.Salter
33 means it was made in 1933
So 1930s not 1960s
It weighed something as the weights suggest.
.......... Terence Wright, Bow, CREDITON Devon, 6th of March 2018