We had no way to get it home so made arrangements to retrieve it at a later date, giving them time to dig it out a bit, no rush.
Today we had a chance to visit it and get photos and measurements. It is 59" x 30". Once we get it home we hope to discover the maker.
What I think we have is a very cool well-used tank design desk.
It has 6 drawers and 2 pull out shelves (The shelves underneath are not part of the desk.) The top is covered with a rubber like material that has wear but in all the right places. The back is enclosed.
I haven't seen any dents or scrapes, let's see if we can keep it that way getting it home.