An historical question about 1964 proof set envelopes and zip codes, scans included.

Envelope #1:

Envelope #2:

Envelope #3:

Envelope #1 is bogus. It's a freshly printed reproduction that I bought on eBay.
Envelope #2 came in as part of a group of "unopened" proof sets, but could be bogus.
Envelope #3 is genuine. It came from a sealed mint shipped box. Envelope #3 is the ONLY kind I've ever seen come out of mint sealed packaging. I've never seen any that were verifiably genuine that did not have the zip code.
I know we started using zip codes in 1964, so my question is this: Were any 1964 sets packaged and issued by the US Mint in envelopes with no zip code? Does anybody have any firsthand knowledge on this issue?
Russ, NCNE

Envelope #2:

Envelope #3:

Envelope #1 is bogus. It's a freshly printed reproduction that I bought on eBay.
Envelope #2 came in as part of a group of "unopened" proof sets, but could be bogus.
Envelope #3 is genuine. It came from a sealed mint shipped box. Envelope #3 is the ONLY kind I've ever seen come out of mint sealed packaging. I've never seen any that were verifiably genuine that did not have the zip code.
I know we started using zip codes in 1964, so my question is this: Were any 1964 sets packaged and issued by the US Mint in envelopes with no zip code? Does anybody have any firsthand knowledge on this issue?
Russ, NCNE
0
Comments
2 Cam-Slams!
1 Russ POTD!
my dad had some he bought original in the early 60's. i don't know what happened to them but i'm pretty sure i remember they didn't have zip codes on there.
2 Cam-Slams!
1 Russ POTD!
Russ, NCNE
and it sets us apart from practitioners and consultants. Gregor
Joe
WH
Joe