What type of Polaroid film is this?

I came across some older photos I want to use in a newsletter. The note I found with these suggests a 1963 date.

However, this looks to me like Polaroid "intergral" film which wasn't produced until much later. The photo is 3 1/2" x 4 1/4". The image itself is 3 1/16" x 3 1/8". The back side is marked "Polaroid 3". It's fairly stiff, so I assume a pack film rather than a roll film.

1963 would have been the introduction year for Polaroid color fillm.

Any idea what generation film this might be?

BTW, that's a well house for a small fish hatchery, not an outhouse.

From the format, they are SX-70 film that wasn't introduced until 1972.

Sx-70

Agreed. That is SX-70 film.

That's what I thought. I also considered whether these may be copies of earlier photos, but if so they were done more or less professionally.