Belly Photo Port

[jchronic]

Any details would be much appreciated; can send to joechr@msn.com so as not to clog up the forum. From what little I've been able to glean, the factory option was only on later, 1970s vintage airplanes? Does that sound right? We had the airplane interior, including floor panels, pretty well stripped over the winter and I didn't notice any spots that looked like possible cutouts for a belly port. Of course I wasn't really looking for that at that point.
Joe