This set of 3 vintage plastic buttons are what I would call royal purple. They are a rich blue with a hint of purple. They are 20mm or 3/4" wide with rounded outside edges and an indented square looking textured middle and about 1/4" thick.
I have flipped one over to show the back.

My inlaws had a general store until 1965 so I know these are at least 55 years old.

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I will happily combine purchases paid together within a 7 day period.

5% Goods and Service Sales tax is required within Canada.