Help ID Finland Modernist Jewelry Hallmark "ROS"

[draketail]

Dear Folks,

I need assistance in identifying the Finnish artist of this ring pictured below. The hallmarks are:

"ROS" = artist/studio
Finnish crown
"925H"
Helsinki mark
"T7" = 1972

Thanks!

Chris

[Matulda]

Your ring was made by Reino O. Saastamoinen in Helsinki. The mark was registered between 1950 and 2001. I don't know much about him, but I've seen a couple of pieces by him in the same style as your ring, so I guess that it is typical for him.

[draketail]

Dear Folks,

Thank you for your time and helpful information. Any other examples of his work I can find photos of would be much appreciated.

Best regards,

Chris