This extremely rare French medieval covered mazer can be compared with an early-fifteenth-century mazer bowl formerly in the collection of the Abbey of Maubuisson and now in the Musée de Versailles (R.W. Lightbown, Secular Goldsmiths' Work in Medieval France : A History, 1978, pls. XVII a and b). The same abbey also possessed a copper-gilt mounted coconut pot probably made 100 years earlier or so (ibid., pls. XXVIII and XXIX a and b).
The wooden mazer bowl was made by specialised craftsmen and the client who wanted his bowl mounted would then take them to a gold- or, in this case presumably, a copper-smith, for the additions of foot, handle(s), and finial etc. A gold-mounted example in the collection of King Charles VI was recorded in the Royal accounts of 1416. This had a fruitelet (presumably the finial or perhaps, like the English late-fourteenth-century Swan mazer, an addition to the centre of the bowl), set with a sapphire and pearls (ibid., pp. 20-21).