I keep a spreadsheet with the date codes of the parts of every telephone I have, so I can tell you really quickly.

Here are the dates from my newest 302

Base-9-52

Case 9-52

Dial 8-52(6A)

Network III-52

Ringer 9-52

Then, the anomalies on this phone-the transmitter is 12/41, and the receiver is 8/48

I also have another '52 302. Here are the dates on it

Base 1-52

Dial 1-52(5H)

Network I-52

Ringer 52-1

Transmitter 3-39

Receiver 8-46