I see it now. If I had to guess -- that looks like it might have dripped 
onto the tube from the packaging. I've seen boxes from the former USSR 
sealed shut with a brittle glue that yellows, and comes off rather easily 
with the thumbnail.

Terry

On Tuesday, October 24, 2017 at 1:14:07 PM UTC-5, Ben Pye wrote:
>
> The glue would be on the last photo (184822), top right of the tube.
>
> The seller does have good feedback, I just wanted to make sure as I bought 
> some VFDs (IV-21s and another I forget the model of right now) and none of 
> those had any markings.
>
> Thanks,
> Ben.
>
> On Tuesday, 24 October 2017 19:08:06 UTC+1, Terry S wrote:
>>
>> The pins look straight, the red paint could be QC marking. I see only 
>> minor marks on the pins that are probably from EOL testing. No darkening of 
>> the glass or any evidence of sustained operation. I didn't see the glue you 
>> mentioned. 
>>
>> They look like new tubes to me.
>>
>> Terry
>>
>> On Tuesday, October 24, 2017 at 12:56:03 PM UTC-5, Ben Pye wrote:
>>>
>>> I recently picked up some IN-12As to use in a future project off eBay, 
>>> advertised as NOS. They are with a variety of date codes/OTK marks which 
>>> was a little strange. Additionally some of them appear to be marked, one 
>>> has a small amount of red paint, another, what appears to be some sort of 
>>> glue. On a couple the printed markings are somewhat worn off. I have 
>>> attached images of some of the questionable tubes. Do these look like they 
>>> are actually used to you?
>>>
>>> Thanks,
>>> Ben.
>>>
>>

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