Help with this hallmark

Hi all. New here and I have a ring that is marked with the following stamps. “900” “SIP” and a hares head with a three facing left. The only information I’ve possibly figured out is the “900” meaning that it’s made of coin silver. If anyone can help figuring out where this is from it would be appreciated!

I can’t tell you much more than that it is 900 standard silver from Czechoslovakia. This page suggests it dates from 1957-1962.


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Thank-you for the information! Looks like you have solved my mystery.