[Collins] Collins 75A4 Serial #1560

[John King via Collins]

I have Collins 75A4 with the serial number  1560. I am curious if the year of manufacture can be determined by that serial number. In addition, I would like to know if any previous owners of Serial number 1560 can be learned or determined. I have a 75A4 manual but I am not positive that it came with my 75A4. I have seen where there was probably 5,000 or 6,000 plus manufactured.

At any rate, if a prior owner of Collins 75A4 Serial # 1560 sees this or is known, I would like to get to know them if they are still living. Any assistance will be greatly appreciated. Thanks and 73, John, K5PGW