please help identify strange silver marks on necklace

[rustyspoon]

Hi.

I came across this unusual antique silver necklace. Can somebody help me identify the maker or at least the country it's from. Thank you!!!
https://drive.google.com/open?id=1mzpyvD5uFOph4QmDSgwtmr0MSKr7_oJU

https://drive.google.com/open?id=12_3E_NZpH6N-T8NsFTY1AHB5CGhlTb8m

[silvermakersmarks]

Hi and welcome to the forum.

We prefer that images be embedded in posts as some people are understandably wary about clicking on links. I have taken the liberty of embedding your pictures here in my reply:





Your necklace is Irish as it has a Dublin hallmark with the date letter h for 1975. The maker's mark is POM for Padraigh O'Mathuna of Cashel, Tipperary.

Phil