18th century old jade libation cup with the handle in the form of a dragon, comes with letter of

18th century old jade libation cup with the handle in the form of a dragon, comes with letter of authenticity. According the experts opionion at the time 1970- the said piece was carved in 'Ch' ien Lung Period 1736-1796' of CH'CHING DYNASTY. [3.5X8.8X5CM]