This nice vintage payphone measures 18" Tall x 9" Wide x 4 1/2" Deep.  Came from a bar in Michigan back in the 80's.
Note: This unit is used and has blemishes you would expect from use in a bar.  Please see pictures.
The unit is untested as I have no way of doing so.  Has the keys at the top of the unit for opening the case.  I do not have the key for the lock by the cord.  I think that might be a bypass lock?

Package is 25" x 16" X 10"
18 lbs 8 oz