Sure looks like a griddle to me. I'd say write to Gagg and ask.

But thanks for pointing to the video - I've heard about those but never seen them in action like that. Cool as hell!

Here is a link that might be useful: video link

The cookware is Demeyere John Pawson. Not sure about the griddle.

It's a stovetop teppanyaki. Demeyere's teppanyaki has a different shape, however. I was thinking that it might be a John Pawson one that isn't on the website yet, but the shape of the handle is different.

Thanks for the help so far. I had noticed demeyere had a very similar pan but it had much higher sides and not as rectangular.

Keep the ideas coming.

It's possible that it's some German manufacturer that we've never heard of.

How about looking through this link and having an online chat with same, in which you ask them to identify the griddle the interests you. Maybe they know of not-yet-released models, etc.?

Here is a link that might be useful: Stove top griddles/teppanyaki