Large 8'x4'x12" optical breadboard.
Magnetic steel top with 1/4-20 threaded holes on a 1'x1' spacing.
Pneumatic damping legs to filter vibrations.
We got it 2nd hand; I don't know how old it is. Probably 10-15 years.
Current version here: https://www.newport.com/p/RS4000-48-12
Located in an R&D business downtown Tucson.
You'll need a forklift to take it out and load it in a truck. If you don't have one, we can point you to the local company we use.
Price is firm.