Although this type of ormolu-mounted glass has traditionally been called Venetian, some scholars disagree with this suggested place of origin. In the introduction to the glass and enamel catalogue of Waddesdon Manor, it is noted that similar glass items appear in several drawings of Florentine origin, as well as in at least two paintings, one by a Spanish artist and the other by a Neapolitan (op.cit., pp. 22-23). Because Spain and the Kingdom of Naples were united under the Spanish crown at the time, some scholars use this as evidence that these glass objects were being produced in Naples, and that their appearance in Spain is therefore understandable considering the close political ties between the two states (op.cit., p. 25).