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Yes: yet another Viewmaster model! I guess I'm officially a collector now...

The Viewmaster Model B was the second Viewmaster design produced by Sawyer's, manufactured from 1944-1947. The Model A was manufactured from Kodak Tenite plastic, which had a tendency to warp; this was corrected in the Model B, which was moulded from more stable Bakelite. Though the Model A and B featured different styling, they incorporated nearly all the mechanical features that would characterize all subsequent Viewmaster models.

SOURCES:
https://www.viewmaster.co.uk/htm/b.asp
https://www.viewmaster.co.uk/htm/a.asp
https://3dstereo.com/products/view-master-model-b-viewer-vintage-black-bakelite
https://www.antiquetrader.com/collectibles/focusing-view-master-history-value