9k Gold Dog Clip Clasp Findings Antique Victorian c1890.
The gold mark can be found to the one side but is quite badly rubbed, there's a maker's mark M&M. Good secure clasp with a good spring.
Size 2.5 x 0.8 cm or 1.0 x 0.3 inches.
Weight 2.9 grams or 1.9 penny weight.