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Both types of these plates had no LEGO logo on the studs, but did have it on the underside in the middle.
Then in 1957 new molds came out with the LEGO logo on the studs. There were only 5 plate sizes until the early 1960s...
Then in 1962 TLG came out with new LEGO molds that used 1/3 less plastic by having circle bottoms (which continues to today)... here are both types together...
Although by 1963 most plates in Europe and Australia switched to circle bottoms, it appears that TLG sent the remainder of their older waffle bottom plates to Samsonite (USA/Canada). There they kept being used (along with circle bottom plates) until 1972, when the last waffle bottom plates were retired.
All known waffle bottom plates only came in these 5 sizes.
Images from the Early LEGO Plates chapter of my digital Unofficial LEGO Sets/Part Collectors Guide.
can you please repost or message me on how I can get your book? Have you looked into doing a printing run? Thanks again, Lois
Those of us who own the currently published version are eagerly awaiting the long-promised revised edition!