traderoftreasures
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thanks pbkPBK said:It's the PTA. The date is commemorative, marking the founding of the organization.
http://www.guidestar.org/pqShowGsReport.do?partner=justgivews&ein=36-2169155
On the back, "L G B" is the mark of the L. G. Balfour Co., founded in 1913, a major manufacturer of school and fraternal pins, and class rings. Orginally, they were based in Attleboro, MA; they're now in Austin, TX.
The other markings indicate that it's 10K gold filled— a layer of gold amounting to at least 1/20 of the total metal.