These are black buttons from Blumenthal Lansing - Slimline Buttons Series 1. These small black buttons have 2 holes, measure 9/16in. (13mm) and are
2 Hole Black Buttons
Two Hole Black Buttons
Slimline Buttons Series 1-Black 2-Hole 9/16 6/Card
2 Hole Black Buttons
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2 Hole Black Buttons