[LRflex] OT: T2 mount - specifications request

A question for technies  ;-)
I must admit my ignorance but I'd like to know what the T2 consists in, notably diameter as I've retrieved a lens that doesn't fit anything I know. Googling was no use, I keep bumping into offers for T2 adaptors but no real definition or specifications seem to be available.

Thanks very much in anticipation
phx

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