Ritas Bazaar has dated this piece to the 1800s.

The recessed central field is applied with a circular silver medallion finely repoussé with a sinuous coiled dragon among clouds in pursuit of the flaming pearl, fixed by four copper rivets, and surrounded by a ring of eight raised brass cartouches of cusped quatrefoil form, each chased with one of the Ashtamangala — the Eight Auspicious Symbols of Tibetan Buddhism: the parasol (chattra), the pair of golden fishes (matsya), the treasure vase (kalasha), the lotus (padma), the conch shell (shankha), the endless knot (shrivatsa), the victory banner (dhvaja), and the dharma wheel (dharmachakra) — the whole encircled by a beaded brass rim.

The reverse retains its hand-hammered copper surface with visible rivet ends and tool marks, attesting to traditional construction. Dimensions: diameter 34.5 cm, height 3.5 cm, weight 861 g.
In good antique condition, retaining a rich warm patina with natural oxidation across the three metals; surface wear and a few small scratches to the reverse consistent with age and use, otherwise free of significant losses or restoration. A genuine and substantial piece of nineteenth-century Himalayan Buddhist metalwork with great decorative presence. Please carefully regard all photos as they make an integral part of the listing, and reach out if there are any questions
Ritas Bazaar has dated this piece to the 1800s.
You can view the stock and full dealer information on the Ritas Bazaar Profile Page