My father, now deceased, was a physician who was given a train set a piece at a time by one of his sales reps who sold Anaprox. The company that sold Anaprox was Syntex. Each car except the engine and caboose has the Anaprox name and Syntex logo on it.  I am just curious as to how old this set really is. I know it is older than 23 years because that is how long ago he retired. I suspect it is 30 or more years old. Any ideas?