The double female was fine, it was either in the 259 or right after, close enough that the connector smelled. No idea where it was made, I have a lot of parts from my hayday 30 years ago & back then it was pretty much all from here. Some are marked Amphenol, some unmarked.
If you open a connection in a system and apply even a modest amount of power, the voltage can be tens of kilovolts.
Damage like you report is not at all uncommon when the load is open.
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