JD 440- is this a 1965??

Seller said his dad/family always thought it was a ‘63; but recently they were told it’s a ‘65. I haven’t reached out to John Deere to see what they could tell me about the machine. I’ve attached pics of the plates (on right-side of eng/trans). In the meantime, I’ve read the operators manual cover to cover, and the family also included a separate book on the winch (haven’t gotten into that yet). Wondering if anyone has a recommendation on a service/repair manual? And/or parts book (if JD even separates the books)? I see some stuff on eBay/web, but thought I should see what others use/prefer before I put down the $. Not to mention this is my first Deere machine so not familiar with the differences between a 440 vs 440a machine. For our small property/wood lot this antique should help out a bunch. I really like the fact that this machine was with one family since 1972. While they may not have believed in paint(!), the rest of the machine appears tight/decent. Of course, it has a few drips here and there, some cracks on blade, etc, but until I drop the belly pans and dig in deeper, I’m not 100% sure. But does run/drive/operate very well as is… Lastly- I’ve never seen solid engine side-covers…was that a JD cold weather “option” (they appear factory with pin/spring/latch/fit)??