One collector's-item electronic indicator tube. This looks like the same kind that I used in the first TV I ever watched... a 12" black-and-white DuMont model, back in the early 1950s!

These tubes are still used as indicators in some of today's high-end receivers...
[Google "em87" with this link !]

Not tested, but the "getter" inside is still shiny, indicating that it doesn't have any cracks that would have admitted oxygen into the envelope.

Includes a socket with attached wires for the standard 9-pin wire connections.

Other labels on it are: Silvertone, 1022-446, and "Made in Austri" so this is probably not a recent Russian knockoff.

Click photos for larger images.