Yes, it's absolutely a Tercio figure. One of their very oldest, and (I suspect) long out of production. Though as was said, always worth asking.
Tercio had a rough time for a while (long story, but basically their regular caster went kind of well, a little funny, and held their production models hostage for months after their second KS... eventually he did some of them and returned the others who were finished by another caster), and their business has never really gone back to being at full steam because of that. Certainly they lost a massive amount of money. They've never released the entire line from the KS, though most of it did make it to the current shop.
But those Kickstarter figures are absolutely beautiful. Some of my favourites from any manufacturer, and even though I had to wait more than a year and a half longer, I'm enormously thankful I did get them eventually.
I wish they could do more sculpting. Seems they've at least gone back and added a couple more minis for 1660, which is nice to see. Hmmm that witch is great...