Hello Ian.
That is what is commonly known as an AVO 8. One of the best multimeters ever made. They were so accurate and, unlike the digital multimeters, they did not show 'ghost' readings, especially in AC volts.
The Mark 5 (which yours looks like Ian) was made in the early 70's or so. They started making them many years before though. Mid 30's if I remember rightly. It wasn't that long ago they stopped making them as well. Around 10 years or so?
I have a couple of versions of AVO meters. One of the early wood and ebonite (sp?) AVO's is in a special wooden display case in our Brisbane house as a feature and I still use one here when I need a good voltage reading. The analogue scale is one of the features I look for sometimes. But I have to say, digital multimeters have come leaps and bounds in the last 15 years. Probably one of the reasons AVO meters have become dinosaurs.
Ah, the memories. I still remember sitting in the meter test room in Grafton with one of those suckers sitting on the bench in front of me.
Cheers Scott