Frustrating research... help!

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Thanks Diana

My pictures are too big to post here, but I have them at: http://parenthood.dropshots.com/day....cdate=20070405

The cell phone is beside them to give you an idea of size.
Once enlarged in the photo, we can see that the letters inside the shamrock shaped stamp are VMC

I assumed they were pewter because of the color and the fact tht they're very soft. If you're not careful, you can bend them quite easily. My son suggested they might be silver? We really don't know how to tell the difference.