http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=300186620250&Category=38034&_trksid=p3907.m29
http://www.nostalgiaair.org/Resources/616/M0013616.htm
http://www.nostalgiaair.org/Resources/611/M0013611.htm
Bob,
The service info shows the 48-1253 using an M-8 turntable and the 48-1264 using a D-10 turntable.
I don't know how different they might be.
http://www.nostalgiaair.org/PagesByModel/065/M0014065.pdf
http://www.nostalgiaair.org/PagesByModel/986/M0013986.pdf
The other half of the 48-1264 schematic, page 19-93 can be downloaded from this page:
http://www.nostalgiaair.org/resources/S00000019%20PHILCO.htm
Carl T
Looking at the Service page 19-93,94 for the 48-1253 I see that it references the 48-1264 in figure 7. I thought maybe that might be a clue but I do not know for sure either. I also notice a tag on my cabinet that has a part number 1 digit different at the last digit as the unit on eBay. At any rate they must have been manufactured very close to the same time.
Bob E.