Gruen Factory stem for 17L caliber V1 to V3 - new in envelope

Gruen factory stem for 17 ligne caliber V1 to V3 Pocket Watch movements and perhaps others, new in envelope. Sometime, identifying parts takes a leap of faith and this stem is one of those as it came from my OLD Gruen factory system (parts often in tiny glass vials with corks) and merely says "Veri-thin" and looks slightly different from the V7 stems I have, hence I have concluded this is for the first generation of Veri-thin movements.  I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. If you need a part for a Swiss watch I likely have it so feel free to inquire. Images do a marginally adequate job of representing the item.