Can Anybody ID this?

[Ltr113]

I previously posted this in the "What Is It" section of T-net but I think it may have some regional significance and therefore I'm hoping someone can help me with some information. When I say regional significance, I mean that someone may be familiar with the letters on the pin and offer info on what the letters stand for.

I found this pin while detecting a high school. The school goes a ways back. It was built sometime before 1950. The back of the pin is stamped with 1/10 10K so I'm assuming it's gold. The actual size comes in smaller than a dime. I'm thinking it is a tie pin for a necktie. In the same hole I found a small 2'' chain that connected it with a 43' (for the year 1943).
I'm also thinking it is from a club or society at the school. I Googled "MCGS", "MeGS" but couldn't find anything. I also entertained the thought that the GS maybe stands for grade school.
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[Gator-Flea]

Could be from a girl's school..................

[Fishermans Widow]

I have something similar that belonged to my dad. Very tiny. His has the initials "LHS", Lexington(MA) High School.

[ivan salis]

m cathloic girls school --or m catholic grade school

[BamofNH]

Sorry to take so long to look at your post but it gets pretty boring looking here at the NH section and never seeing a post for months. OK back to your post. I found this on a quick research and maybe you can research it a bit more. This might be what your looking for - MARQUETTE COUNTY GENEALOGICAL SOCIETY of Michigan. Good luck with your research and hope this helps.