Is this a 461 or 579?

I would guess 579. My 461s don't have the windows. But, later ones might have. Sako Collectors Forum would know for sure. FWIW I have a Canjar single set trigger for the 579 and it works perfectly on a 461 other than fitting through the trigger guard but that has more to do with the wide shoe.I was told the 461 and 579 were interchangeable.

Looks vaguely familiar to my 579. If you remind me in a day or two I will dig it out and check.

Thanks

Ive just checked my 579 and its the same trigger as in the picture
B