Mystery K&T hand tool

[Hchrist]

This looks like a brad pusher but I'm looking for confirmation. There are no adjustments. The center shaft is spring loaded. When the top is left pushed (the red "button") the Jaws open. In the photo where the jaws are open the center shaft is fully extended so???
Thanks

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[Caddybill]

Philips head screw starter
https://www.amazon.com/SE-7507SDS-Slotted-Precision-Screwdriver/dp/B008CO88XW/ref=asc_df_B008CO88XW/?tag=hyprod-20&linkCode=df0&hvadid=309735728871&hvpos=1o4&hvnetw=g&hvrand=4723291919054258303&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9004380&hvtargid=pla-566961485020&psc=1#

 

[Hchrist]

Philips head screw starter
https://www.amazon.com/dp/B008CO88XW/?tag=atomicindus08-20

Must be missing a piece.
Slotted head screws.

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[Hchrist]

Turns out it is a watchmakers tool for installing balance spring screws.

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