Re: AVO Multimeter survey
Up to around 1972, the serial number is on the scale plate in at the extreme lower right-hand edge. It may be necessary to tilt the meter to see it.
The earliest serial numbers are in the form 7mmyy-XXXXX or 40mmyy-XXXXX where mm is the month and yy the year. From the mid 1940s, the form does not include the model number and will be XXXXX-mm-yy.
From 1972, the serial number was on an external, self-adhesive label on the right-hand side of the back case near the centre top edge. It has silver characters on a black ground. There was a second label inside the battery compartment of Model 8s from this time, but I don't think this was done for the Model 7s and 40s.
PMM
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