Hello Steve and all,
I was very surprised to see the comments suggesting a tundrius ID on this
bird, but it gives me a welcome chance to reflect and go back over the ID.
Looking at John Tubbs' photos, it looks like the contrast and levels have
been adjusted, and the photo sharpened quite a bit. I think this accentuates
the moustachial mark, which wasn't that remarkable to me in the field.

However, this bird is most definitely not a Peregrine Falcon. When I first
saw the bird, I passed it off as a Rough-legged Hawk because of the huge,
burly chest and broad shoulders. Once we got a scope on it, it became
clearly a very large falcon. The primary tips reached only halfway to the
tip of the very long tail. The overall clay-gray plumage and the dense
streaking on the underparts are wrong for tundrius, which are paler birds
with frosty crowns.

There are a couple other interesting possibilities, all involving hybrids
from captivity, and probably not involving Peregrine Falcon, but that would
be outside my area of experience. I saw little difference between this bird
and any other Gyrfalcon I've seen (15 or so over the last 8-9 years). Please
go back to John's first photo that he posted, which shows the structure a
little better (including the primaries).

Note that Gyrs do sometimes show a bit of a contrasting malar, such as this
bird: http://www.indianaaudubon.org/guide/jpgs/kankakee02.jpg

Thanks,
Charlie Wright
Bonney Lake, Washington