As I said above, I'm not a great expert on Maltese silver. I simply included an image from Victor Denaro's book that seemed relevant to the topic, and as I said, it could be a lead for further investigation.
Furthermore, I don't know if Geraldo and Paolo Pace were brothers or relatives, or if they worked in the same shop. Nor do I know if the Geraldo Pace on page 188 of the same book is the same Geraldo as on page 191, a relative, or simply a namesake.
What is certain is that the bird symbol has been recurrent on the marks of silversmiths with the surname Pace since Giuseppe Pace (1806).
It's a rather tangled mess, and it would take someone more expert than me to unravel it.
Regards
Amena