I've saved an AVO Test Set Multi-Range No. 1 from becoming another lamp foot or timepiece.
And unlike the last AVO 8 I acquired (with O/C meter), this one appears to be functional & no leaktubes left inside
, I've not checked the accuracy yet though.
Not 100% sure if the year is 73 or 75, S/N is 14228-10-7x
David