I see, but I believe the ads just refers to it as an "Excalibur" meaning a retro-style car.
I believe Studhamsmudger is right saying it's based on a Mitsuoka Le Seyde. In fact, the front and the wings look much more similar to a Mitsuoka than to a genuine Excalibur.
The point still unknown is: who made it as a wedding-car, actually?