Antique Bracelet, Marks I can't Read believe its 1880 by style

[Bobbie2214]

I have had this bracelet for about 15 yrs and love it but have tried for years to find out about it. The makers marks are so small I cant read them. I have looked for the marks by shape but have had no luck. Im hoping you can help me. Any help is appreciated.

[AG2012]

Hi,
Portugal mark for .833 standard,town is Porto.Used since 1938.
The mark on the right is maker`s mark not known to me.
Regards

[Bobbie2214]

Thank you for your help