That's probably a General Radio (GR) Strobotach. Wish I had one.

Bill Jeffrey
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Henry Kolesnik wrote:

I just got this black box with no mfg or model #. It's 6.5" wide x 8" high
x 7.5" deep with a 5.5" reflector for the strobe tube. It has 3 tubes a 6X5,
6N7, and a 1D21/SN4 srtobe tube. A big front knob controls a dial that is
visible on the top with 2 scales on the dial: 6 to 37 and 25 to 145. If
anyone can ID the mfg and model I'd like to see if I can find a schematic.
tnx
hank wd5jfr