When I first started restoring sets, the first set I got was my Hallicrafters 820 (my avatar photo) The 16tp4 crt was broken during the shipping of the set to me. I hunted for a long time to try and find a replacement.
I do not remember exactly how I came about getting in contact with Logan TV in Greenburg PA. Seems to me I was asking through the grape vine for the names of old tv shops. But somehow I came across Logan TV,
I purchased a NOS 16RP4 from Logan. I still have the crt in the original box with the warantee card that came from the CRT rebuilding company which was located in Pensylvania.
According to what I found on Facebook the Logan TV in Greensburg PA is still in business at 526 Mt Pleasant ST in Greensburg. Says they have been in business since 1943. Run by a Jim Logan. Wonder if it is possibly a relative in the Logan family? Jim Logan is not listed in Alfred Logan's Obit.
This may have been Alfred Logan's business
http://www.cmbfast.org/details/186268.htm
Logan's Tv Svc
3509 Cranston Ave
Wilmington
Delaware
19808
And, according to the obit, this is his son Daniel Logan who operates Logan Electronics
http://www.delawaretvrepair.com/
https://www.google.com/maps/uv?hl=en...9gAgIQoioIbDAK
This is all I can find. I bet if you contact Daniel Logan at his business number 302-378-3640 he can give you a verbal history of the Philco 123 sets.
That would answer a lot of questions and it is always nice to know the history of the sets we collect.
Good luck Nick in your quest to get thee history of your rare Philco sets.