This listing is for one crystal per transaction. These crystals are the smaller round ones in my vintage watchmaker's crystal cabinet. The size is 10 Ligne, the size of these range from approx. 22.67mm for the 10 0/16 to 24.85mm for the 10 15/16. I will measure for size if you ask. Price is for one crystal only the cabinet, ruler and drawer are not included! Most of these are semi thick with low clearance as seen in the scans. I don't find any of this size anywhere else here on eBay! Returns accepted within 30 days of delivery, buyer pays return postage. Ask questions before buying!