Came back from holidays, I received my huge packet, full of nice surpises inside! Christmas in july
After many researches, I think that I could identified a Mc Guire extraction harness.
The harness is rigger modified too with a piece of cloth A7 strap used as a second liaison part between the two main straps with the hooks. Buckles are date 1962.
With it, the sender put a A7 strap (rigger modified) usually fastened around waists and used as a second safety measure (when time was on their side).