Being a bit of a vintage test gear nerd, I scored these beauties which arrived today!!
For new players and those that are not familiar with UK test gear brands, these are the legendary Avo 8, possibly the best analogue multimeter ever made.
First pic is the Mk4, dated 1972, in mint condition, I doubt it has ever been used! Complete with leather case, leads, probes and destructions!
Second pic is the Mk5, dated 1973, same condition and accessories.
I've been after both versions, in this condition, for years! They weren't cheap, but then again not expensive considering what they cost new!
The Mk5 was £500 in it's day! So my Avo collection nears completion, I need a model 9, which is extremely rare, a Mk6 and a Mk7, those not so rare but difficult to find as new. The 7 was the last Model 8 made when production ceased in 2011, list price then was just shy of £800! According to Megger, the company that produced Avo meters then, production only stopped because certain parts could no longer be produced, demand was actually still there!! They didn't have the extra high voltage range though, evident by the lack of extra terminals at the top of the front panel. The Mk5 could read upto 3KV!! One of my favourite things about these meters is the test leads, thick, flexible, heavy duty, and very high quality! Even though they have never been silicone they have always been so flexible, even in cold conditions!
The Mk3 that I have a few of was never quite enough until I got a tidy Mk5 especially for its 3kV range.
My solution to the 15V battery issue was a stack of LR44 with a little copper tube each end to pack out to the 15V battery length, all excepting the very ends covered in heatshrink which allowed for a neat fit into the OEM 15V battery holder. 
The lead set for yours looks in spectacular condition along with those darn hard to find hook grabbers of which I also have a pair.
Nice find, treasure them. 
They will be cherished, which sadly means they won't see alot of use, the penalty for having survived in such superb condition. I do have some users though, which I like to use on vintage valve equipment, seems so appropriate! And of course indicated voltages on old service sheets were measured on Avo's, or 20K ohms/volt meters, so it's easier to compare readings.
I went through a phase some years back, of buying up every set of Avo leads, probes, clips etc in excellent to new condition I saw on ebay, so I now have a good stock! This was before prices began to escalate. I also bought loads of the shunts, voltage transformers etc.
Although my collection is nothing compared to a fellow collector I know, about 40 miles north of me, he has just about every Avo meter and accessory ever made, and, a huge stockpile of parts! A whole room in his house is dedicated to their storage and display, shelves all around the room, about 5 or 6 high, it is truly incredible! And, he repairs and restores them!
Sadly, Megger are just not interested in the meter that established their name and reputation, so have no company collections or archive document library. So it's down to those like myself and above mentioned friend to preserve their history.
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