Early Victorian Blue & White Overlay Glass Butter Dish Silver Cow Cover

A very striking and fine quality cut glass butter dish and stand, German or Bohemian, with double layer blue and white overlay, cut-to-clear in a pattern of large circles and quatrefoil and trefoil shapes. The stand with star cut centre and the tub with raised trefoil shaped lug side handles. The cover is English sterling silver and I believe it to be an original combination as the cover fits absolutely perfectly around the handles and the glass dates to the same period as the silver, c.1840-1850. The silver cover has fine and ornate engraved decoration to frame a vacant cartouche on either side and is mounted with a finely detailed model of a recumbent cow. Both cover and cow have a full set of hallmarks for Sheffield 1847, makers Hawksworth, Eyre & Co.