Experimental S wing poppets

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Bryan@Vintage Double Hose

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Considering the source I believe these could have been experimental S wing poppets.
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I have a few of the gray poppets so they fit somewhere in the SP poppet evolutionary chain. I suspect they were meant to replace the blue poppet of the BA and the 109 poppet. The stem, a seat with a hole, and a flow thru rivet would fit in a BA. (the next part is conjecture) The poppet sans stem with a puck seat could be used with a 109. Prior to this iteration, neither model had a replaceable seat.

I've never seen the other two.
 
I also found a bag of what appeared to be black percussion caps. It looks like they were experimenting with some different types of seats for the eraser head poppet. All of them were hard as a rock though.
 

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