CT-100 Flybacks

I recently purchased a used CT-100 flyback. The numbers on it is 274406. I was told the RCA CT-100 flyback number which starts with 79 never appears on these parts. I compared this flyback to the one in my working CT-100. The number on my flyback is 274416. The number 1107355-1 also appears. I compared the various terminals on both flybacks and determined that the one I purchased had an extra terminal (#4) and it associated wire to the transformer as well as a transformer wire going to terminal #T and a 4.7K ohm resistor going to terminal #8 (no transformer wire on this terminal). My existing flyback has no terminal #4 and terminal #8 has the wire to the transformer and terminal #T is just a tie point for the 4.7K ohm resistor (the reverse of the one I purchased). The resistance of the flyback windings appear to be identical in both flybacks. If I were to wire the new flyback in my working CT-100 and reverse terminals #8 and #T I believe the one I just purchased would work.
I talked to another collector and the part number on his CT-100 flyback is 274410. Now we have three different flyback numbers. His terminals were wired the same as the flyback in my working CT-100. Apparently the flyback I just purchased is from a earlier CT-100 design. I also checked the schematic of my Model 5 and that has a HV doubler using three HV rectifier tubes so it uses a completely different flyback.
Any comments on why there are were so many versions of CT-100 flyback produced? We wonder if the last three numbers of the 274 number are not date codes (i.e. 274406 = 6th week of 1954?) and the number 1107355-1 is the real number for this part. I just found out that the number number 1107355-1 appears on two of the three flybacks (the third flyback has the second number unreadable) Wayne

Correction: My Model 5 has a Flyback transformer very similar to the CT-100. It is marked with number 274340. Part number 274 made in October of 1953.