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Looks like in the later days of the SG3 typewriter production, Olympia finally got around to facing the need to come up with a re-design of their plastic paper support (that is missing on so many SG1 and SG3 machines).
This "new-in-box" SG3 is on eBay out of Spain (I borrowed the seller's photos). Seller is asking nearly $ 1,500 USD for this typewriter.
The re-designed paper support is identical to the support Olympia used on the SGE-45 electric standard.
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I've grown accustomed to the clear plastic support, but this looks to be much more functional.
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And it appears also on the SGE 65. It seems the the newer design has a non-transparent frame around the clear center that consists of a less brittle plastic material than the old full transparent design.
Photos from an ad (German classifieds):