Could it be a WheelsMfg bottom bracket?
https://wheelsmfg.com/pf30-threaded-abec-3-bb-black.html
Take it to your local bike shop?
My friendly LBS was willing to lend me the correct tool (which they have used once in the 5 years they have it) and I got it out with medium swearing.
It's a Wheels MFG 386 EVO as it turns out. (cc @mdcc_tester )
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@peter_v started
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Could it be a WheelsMfg bottom bracket?
https://wheelsmfg.com/pf30-threaded-abec-3-bb-black.html
Take it to your local bike shop?