Polaroid SX-70: Model 1 vs Alpha 1 - MiNT Camera Blog
File:Vintage Polaroid SX-70 Land Camera Alpha 1 Model 2, Same Features As The SX-70 Model 1 Except Finished In Black Plastic And Brown Porvair, Made In USA, Instruction Booklet Dated 3 77 (35836751016).jpg - Wikimedia Commons
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