Vintage Silver Tone Curling Rock Brooms Brooch Pin Poss. Avon GUC Stamped

Vintage silver tone curling brooch Stamped "Reg 58 5871 ES" on the back Possibly vintage Avon? But without an Avon stamp I can't verify In the shape of a curling rock with two crossed brooms in an oval setting Rollover clasp Measures approximately 4.5 cm wide and 4 cm tall In good condition all around. Minor scuffs/marks/scratches throughout. Clasp is secure. See pics.