Please help ID these marks on a well made brooch / pendant

[music-surf]

I've been looking at this piece for quite a while now and am no further than when I started. It looks like the center piece with the pearl and rubies was added to the piece. The marks are on the bale. Any help is greatly appreciated.

http://s19.postimg.org/mguhl80ab/IMG_6647.jpg
http://s19.postimg.org/knrkwwf3n/IMG_6648.jpg
http://s19.postimg.org/5chrwahrn/IMG_6643.jpg
http://s19.postimg.org/y3elmcnlf/IMG_6645.jpg

(admin photo edit - images too large - link only - see Posting Requirements )

[dognose]

Hi Music-surf,

I'm probably barking up the wrong tree here, but when you look at this mark in the flesh, how does it compare with the mark on the left?




Trev.

[music-surf]

It is actually extremely similar, what mark is that?

[dognose]

It's a mark that is struck on jewellery by the Porto assay office. It was in use from 1938 until 1985.

Trev.

[music-surf]

Thanks! I'm guessing the other mark is likely a maker's mark.

[dognose]

I would assume so. Hopefully other members may recognise it, and confirm/deny the possible Porto mark.

Trev.