Re: AVO Multimeter survey
Okay, it's definitely a Model 40 Mk II (so, post 1956),
but the movement has an unpainted "Alnico block" magnet - which suggests that it was either from a Mk I (1946-1956) or from a brief gap (pre-1964) when the red painted magnets were replaced by blue.
The serial number - on the scale plate - suggests much later than I would have expected posible, although date codes were sometimes rewritten if a meter was dramatically overhauled, and the format is still strange (to me).
I think this is may be one of those cases which will only be resoved if you allow PMM to ingest the smell of the works - his nose is better tuned than mine ! !
More to the point, how accurate is it ? Does it do the job ? Do you TRUST it ?
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