[Ron Ramirez]

What I am saying is that if they produced a chassis as a code 121, then the next in line would have to be a code 122, if there is a code 125 then there has to be a code 122, 123, and 124 version as well.

Not necessarily. Philco's 38-116 was produced only in Code 121 and Code 125 flavors. There is no factory data on any other production codes for the 38-116, and as no other codes have been found, we can assume there are only the two production codes for this model.

This holds true for USA-made Philco 38-116 sets. Canadian 38-C116 sets may differ in production code numbers.

Another thing about 38-116 sets. 38-116 Code 121 models used the 1937 RF unit (same as used on models 37-116, 37-675 and 37-690), with a multitude of adjustments. On the other hand, 38-116 Code 125 models used a different (new for 1938) RF unit with relatively few trimmer condensers. The later RF unit is the same one as used on model 38-690, code 125.