Any info on an old zodiac pendant?

[Femalejordan]

This is an old pendant, was my grand mothers. No markings on the back with a year or name unfortunately. But I'm curious if anyone can guess when it's from? Or any info at all would be helpful! I've had it for about 10 years and know nothing about it. Also strange that it has all the zodiac symbols and a clover(?) in the center. Help me figure it out please!