Not quite. In oven work, the glass is taken from the oven in a molten state; a little ball is made which is rolled in gold foil, which is then blown out into the final shape. In lamp work the starting material is a factory made glass tube which is heated in a gas flame. The difference is that lamp work can be made anywhere and is very thinwalled and very light. 15cm is an inbetween size so unable to tell which technique is used. The pontil mark is finished which looks good for oven work. If Italian I would guess Salviati - but there will hopefully be others to confirm or contradict.
Maybe moving this to the Murano section would be a good idea?