Thats what I thought too partner 7700 = jred 2077, except 710 is a the 71cc version like the poulan 445.
Look like a jonsered 2177
Surely, this saw family is all based in the Partner P7700. There was no husky version, but at least most of the saws were actually made at the Husky factory in Sweden.
65cc: P660, PP415/425.
71cc: P710 and PP445.
77cc: P7700, 2077, 2083 II and PP475.
82cc: 2083 and PP505.
Early saws did not have the fully developed "Air Injection" (different names between the brands), and had a pre-filter. Later saws had the fully developed "Air Injection".