The flash bounced back really badly in his picture. Looks SS.
I see three thing that tells me it's blue.
First, he mentions blue.
2nd, I have not seen a SS frame with the whole cougar body on it (this is not to say that they were not made).
3rd, I have not seen any SS frames with the pivot pin in the front of trigger guard. That makes it old style frame. They changed that with serial # 195,000 in about 1981. Don't think they made SS frames then.
Hate to say it BUT I think you should have done your home work a little better and go ahead and enjoy your new frame.
JD