Stainless Steel Bottles seem to look good nowadays, used on the Tour a long time ago and now, I don't know why, seem to have made a comeback. Maybe because they are more sanitary and definitely, durable and can be cleaned.
Plastic is a flimsy product. I had an older Peugeot bottle that came with the bike but it got vertical cracks.
I'd venture, for a real '70s look, you want one that has the little shower thing on top, the salt shaker top along with the drinking top. Much like this:
In fact, the Peugeot one was like this one I think, no stamping of the brand name on their, just a white bottle.
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I was cruising ebay and I saw one of those bottles where you open it up and it was like a thermos, with aluminum or stainless steel siding inside if that is understandable. I think I once had a bottle like that as well, thick plastic on the outside. On ebay they were calling them "children's bottles" so who knows but still in the cycling area.