Unusually Thick Round Mirror with Large Raised Central "frog or "Flayed Lion" Nub

Surrounded by six playful “lions”/”frogs” among grapes. An outer wide band of flying birds among grapes, butterflies/insects, silk-worms and mulberry foliage. Nice lustrous patina.
Probably Sui dynasty. China.
Diameter: 19.4 cm.
Thickness: 1.7 cm.
CM034