Some research on the web resulted in two interesting discoveries and an added mystery. On Darryl boyd's excellent web site I found in the plans section a mention of this very set, or one very near to it taken from the March 1995 issue fo Popular Electronics. The text of that issue I have shamelessly copied and placed below, the critical text highlighted in red. Importantly, the text references the September 1972 British journal Practical Wireless. I subsequently found an image of the cover of the referenced Prac Wireless issue with the set nicely featured. So, I have to assume this set is homemade at or soon after the publication of the plans in that issue. I assume the set was made in USA, but cannot be sure at all.
The new mystery? If you look closely at the radio I have, the drawing in the Pop Electronics article and the photo of the radio on the Prac Wireless cover, you will see virtually the EXACT SAME set right down to the hardware and placement. Only a few minor differences. My mystery then is this, was this an extremely faithful homebuilt version from detailed plans? Or, was this a kit? As I cannot locate an actual copy of the Sept 72 journal, I still can only speculate. I do hope it is a true homebuilt.
The following photos show the set and the references mentionned above.