Can anyone ID these greek wall tiles? MSO? MSPO?

One of them has a "made in Greece" sticker on it which sure helps with the origin but I can't identify the maker. Is there a reference site for Greek porcelain marks?? The hangers have some corrosion on them so they aren't spring chickens. Probably late last century sometime.
Cheers
Stephen

 

Their size if anyone is interested is 12.3cm square.

 

found some similar, but nothing on this artist

www.ebay.ca/itm/Valsamakis-Grec-Greek-Art-Modern-Tile-Plaque-Panel-Ceramic-Ancient-Warrior-Horse-/132291300771

 

Thanks for trying AJ. I found that and a bunch of others using google images search but nothing with my logo. Greek porcelain is amazingly frustrating.
Cheers
Stephen

 

I know this is an older post but wonder if you ever found out anything about your greek tile? I have recently found several myself and they are beautiful but wonder about their history and worth. Both also say handmade in Greece. Thank you

 

Alas I did not find anything else about them and their worth is limited to how pretty they are and if someone else wants them for a decor project.