Yes they are, Ake. I've been using them since the late 1940s, and my father before me from the early 30s. And the old ones are still going strong (like me, I suppose)
The original batteries are long obsolete, replacement test leads now cost more than the meters themselves, but they're still infinitely better than the oriental digital flimsies which somehow can't quite displace them !
Which is why I collect them and, if not them, their serial numbers.
Thanks to everyone who's replied so far; keep them coming, though. As I've heard of nothing pre-1935 I have to conclude we're a classy, progressive, sensitivity-demanding lot.