Coding questions on my SN 4020 A7 Type 40

[RotoTech99]

Here are some codes on a AE40 I've discussed in Collectors Corner that I wanted to see if CRPF can give me a idea of its origin.

Set Code: SB 4020A7 Y08

Dual Cap.#: D-56540A .4 mf talk, .7 mf ring.
Dial: 24A36A with AK-38 dial card
      Date code 060A 74(?)

Ringer: D-56465E, 66 to 66.6 cycles

Receiver: D-5189A EB Transmitter
D-38309B