Ok, I extracted the AVO Model 40 MkII (I stated in my previous post that it was a minor... but it is not) from it's plastic storage bag (it has been contaminated with battery acid leakage); the S/No. is 17411 - B-359 (March 1959). On the back of the meter scale is a hand written 28/2/62 and signed by what looks like 'Les'. There is also an E followed by the date 6/3/61... again hand written. I don't know what to make of all those dates... but I feel an anorak coming on, so I won't worry about it
As I stated above this AVO looks in quite good condition but has been contaminated with battery acid... I will start another thread later to see if anyone has any ideas on how to decomtaminate it so I can get it up and running againg. If you touch this AVO you end up itching as the acid attacks you... a man eating AVO LOL
DaveH-UK G4NWP