The Portland Stove Foundry, maker of Atlantic (Queen Atlantic) stoves, was the largest stove foundry in Maine, but I can't locate a model from them with this door (but haven't dug too deep). There were foundries in Mass and Vt. too, which I haven't looked into, but it would seem it shouldn't be too far from "home" (being brought in by train).
Around $100-$125 would be my estimate on your stove tile (as their called), as they can be found listed anywhere from there up to $200, but those are asking prices, the higher end which might not be obtained.