Help with figuring out this copper pan, please!

Hello!

I'm having trouble telling if this copper pan is tin-lined or not, and since it's a potential purchase I don't have the opportunity to cook in it and see if it darkens. How to tell? What does it look like to you folks? It's very shiny, which gives me pause. It may have been retinned, but I can't tell if there are "brush strokes" characteristic of tin linings (I'm new to this!).

It is also unstamped which makes me wary as to its quality. That brings me to my second question: If a piece of copper cookware is unmarked, does it necessarily belong to a "lower tier" of copper cookware? It seems like it could be old to me, but only because of the signs of use displayed on the copper; since I'm new to copper cookware, however, I understand that those dark splotches may appear pretty quickly on pieces, and therefore not necessarily hint at their age.

Many thanks for any and all advice!