Really hard to discern but all the markings are on the loop section under the trident shape. Not sure what the figure represents, but with the maritime/anchor link chain and the Trident, maybe something to do with the sea? Okay, total amateur stab at it, but I do know it is silver and so is the chain. The chain is signed near spring clasp; 925 ITALY UNOAERRE.
I know the signage denotes it was made by UNOAERRE, a company that has been around for over 90 years. Chain measures 24 1/2 from end to end and weighs 27 grams. Pendant adds another 11 grams to the total weight of piece and measures about 1 1/2 Really a beautiful piece that probably symbolizes something--but not sure what. Please do make a offer if you are interested.