Old Radio Colpitts Oscillator? Or not?
At first glance T102 looks like a common-collector colpitts oscillator but it isn't. It has split capacitors (C108 and 109) on the emitter but these do not feed to the base so that is ruled out.

On further inspection and noticing D101 (a varactor diode) it's clear that it is a tuned-collector-oscillator with capacitors C126||CT103||CV103||[C113+D101] in parallel with inductor TR103. C111 is the feedback circuit from the tank to the emitter. That feedback is attenuated by C108

C109 takes the oscillator signal at the emitter of T102 and "adds" it to your received signal from T101. This addition of signals is non-linearly amplified by T103 and you get an "addition" turning into a "mix" (multiplication) with sum and difference frequencies produced at T103's collector.

Here's the closest diagram I could find of the type of oscillator you have: -



See figure 8 in this link.