You are looking at a brand-new Craftool Celtic Stamp Set.  This item 69015-00 is a set of four separate, quality made stamping tools. When these are stamped side by side, they create a border that looks like Celtic edge. 

 Specifications

• Short Straight Stamp: 3/16 x 5/16 in. (4.76 x 7.94 mm)
• Long Straight Stamp: 3/16 x 5/8 in. (4.76 x 15.88 mm)
• Corner Stamp:           3/16 x 7/16 in. (4.76 x 11.11 mm)
• Curved Stamp:           3/16 x 3/4 in. (4.76 x 19.05 mm)