Hello, trying to identify these blue tinted glass vases with gilt chinese subject decoration. they appear to be etched or engraved and gold filled into the shallow groves of the design, as well of some on flat surfaces like faces. each one shows small differences in detail of design and reversed as in most pairs. could this be hand done or some sort of printing plate used in process? the bottoms have polished out pontil marks with signs of use. height 8 inches. Lost on this one and would appreciate any info as i haven't seen any these before. thank you