Thanks LarryEA. I live in the southeast not far from Philadelphia.
I got the machine over 20 years ago and began to take it apart to restore/refurbish it. What I found was that I mainly cleaned it up, changed the oil in the reservoir, changed the main gasket, set it back up. During this process, I had questions so I called Delta and was transferred to a fellow in the parts department. When I explained the machine and what I was doing, he said I called just in time. One of his coworkers was retiring "next week" after over 40 years of service and knew those machines inside out. He was right! This fellow started asking about the machine starting with newer components and working back through the years. He started with was the light shade plastic or metal, was the compressor plastic or metal, and worked his way into the machine asking if the fiber reciprocator was round or square. Then if it had a belt guard, etc. He explained the machine was from pre-WWII design based on what it had. He explained that when we went to war, civil production ceased and war production began. During WWII the machine was not built. When the war was over, the old plans were pulled out of the drawer and production restarted. Then, modifications were made to update the machine beginning in about 1947 era. Also, based on my Uncle being over 80 now, and he remembers the machine in his father's basement shop as a very young child, the saw was probably there during the war. There was no television when my Uncle grew up, so every evening they went down into the shop to make projects and build wooden models.
So, after that long story, I want to say there was at least one very helpful employee at Delta. I appreciated the time he spent with me and the oral history of the machine that he gave me.