Hello Javier - buenos dÃas,
Always welcome in the forum »925-1000« with your questions.
For first aid, please look here:
http://www.925-1000.com/Fitalian_marks_01.html
There you would observe that on Italian items most times are also struck maker's marks.
In your photos are only visible the mark of Venice, and the fineness-mark 800.
Please, search on your vase, to find also there the maker's mark. If there is only visible a name-punch, that could be a retailers mark. Then please search further on your vase for a maker's mark, as they are shown in above advised info-link.
Let us know, please, the result of your searches.
Thank you!
Kind regards silverport