Venetian cannon inscriptions

[Vanvlak]

Hmm, Marcantonio di Niccolo Dei Conti (the third cannon's founder)(?) is proving a tougher nut - he's a bronze caster, but the dates are off when compared to that indicated on the Nafplio cannon - 1576-1638.
More digging needed!

Also - in my previous post I quoted that the Bembo arms are the ones to the left - in fact they're the ones in the centre.
The left hand arms - no idea.
The right hand arms: could be more than one, as the colour is obviously not included, so that could be a Morosini, Sanudo, Amizzo, Condulmer.
Source: https://it.wikipedia.org/wiki/Patriziato_(Venezia)

[DintheDin]

I have almost these same photos from Nauplion. Wonderful town, been there twice. 

A place full of history. You may like one more photo. The place where the cannons are. At a distance, the fortified islet of Bourtzi.

[DintheDin]

Hmm, Marcantonio di Niccolo Dei Conti (the third cannon's founder)(?) is proving a tougher nut - he's a bronze caster, but the dates are off when compared to that indicated on the Nafplio cannon - 1576-1638.
More digging needed!

Also - in my previous post I quoted that the Bembo arms are the ones to the left - in fact they're the ones in the centre.
The left hand arms - no idea.
The right hand arms: could be more than one, as the colour is obviously not included, so that could be a Morosini, Sanudo, Amizzo, Condulmer.
Source: https://it.wikipedia.org/wiki/Patriziato_(Venezia)

Thank you once more! These are the advantages of collective research, everybody becomes richer getting additional and complementary information...

I also found access to your source:

https://books.google.gr/books?id=HwusDAAAQBAJ&pg=PA55&lpg=PA55&dq=Marcantonio+Nicolo+di+Conti&source=bl&ots=CoqLBsUCLt&sig=2UHucQfGnpb5KyEb-tvGpLfrJGo&hl=en&sa=X&ved=0ahUKEwi7-O-Z5YHTAhXJfRoKHfh8DzQQ6AEIHTAA#v=onepage&q=Marcantonio%20Nicolo%20di%20Conti&f=false

The little bulge at the left, near the letter N of NICOLO (difficult to read) must be the small letter "e". So, the inscription reads: MARCANTONIO e NICOLO DI CONTI (brothers)

See p.56 of the link, fourth line from the bottom

155 colubrina bronzo Marcantonio e Nicolo di Conti 1685 Grecia