They probably are old Franzite grips from the 50s or 60s. They had several different styles, all plastic or bakelite, and were pretty good replacements for shooting. This "rainbow" multicolored version was not a big seller and as you have seen, that particular blend of plastic had a tendency to shrink and not always in the same dimension. This is the first time I have seen a set that shrank lengthwise.
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If it's made after 1918...it's a reproduction
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