I have had the same socket appearance with a few of the "gold label" GR-414 tubes. Jens

On 9/30/2017 4:45 PM, Dekatron42 wrote:
If you look carefully at the photo of all four tubes you can see that the one to the right has a different label than the other three, it also has a date code on that label which the other three are missing. My guess is that the three with the same label have another type of bakelite socket compared to the one on the right, maybe they changed the type of bakelite between these two different models.

The one on the right looks similar to the leapsecond photo as that one also has a date code.

/Martin
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