Compare with the topic on my two ewers with identical feet:-
Please help with two lovely pink ewers.
Here, amongst several replies, including a similar view to the one above by Ivo, was one by GMB member heartofglass (Marinka), who noted examples of similar glass with Murano labels.
Re your mould lines, note that I have been told on one of my visits to Murano that pressed glass components are quite usual in Murano glass. The two examples I was given were the Murano lampwork peacock, which is now made from a pressed glass base to which the lampwork is added. If it's all lampwork, then it is not Murano. ... and chandeliers, which contain pressed components.
As Ivo said, once you have given this topic a couple of days airing on the Glass forum, you might find it productive to ask a moderator to tranfer it to the Murano forum.
Bernard C.

ps — Any more opinions on my ewers, anyone?