Snow Goose - Blue or Intermediate ID needed

Just got this mount back, one of the first snows I've shot and was told it was a good one.

Trying to understand the snow goose phases and whether this is a true blue, or an intermediate...or maybe a juvenile??

I'm very happy with it, we call him Earl...just trying to understand the hierarchy and whether it's a really good specimen or just guide talk.

TIA

Ps the leg jewlery is an inside joke add on.