(1965) Diet Dad's Root Beer Bottle

I was hiking today in Franklin Township, Somerset County, New Jersey when I found this bottle buried in a Farmer's old dumping pile at the edge of a former field.

It's clear and embossed rather than having a label. I can't seem to locate another bottle that looks like it on the net so I'm not sure what year it's from. Closest thing I could find was a half gallon Dad's Root Beer jug that was also embossed. Everything else seems to have some sort of label. Below I've written out all the info that's embossed on the bottle. It also has a texture pattern like a barrel.

Edit: @aghcollect Tipped me off in the comments that the 65 embossed on the bottom is actually the year code.

Text - Side 1 :
----------------
No Return
12 FL. OZ.
1 Calorie per 8 FL. OZS.
Diet Dad's
Root Beer
Root Beer Flavored
Carbonated Beverage

Text - Side 2 :
-----------------
No Deposit
12 FL. OZ.
1 calorie per 8 FL. OZS.
Diet Dad's
Root Beer
No Sugar Added
Artificially Sweetened

Text - On Bottom :
-----------------------
DES PAT NO 193533
Not to Be Refilled
65
14 - 3117
Copyright By
Dad's Root Beer Co Chicago Ill

If you have any info please feel free to share.