Weird that the factory made 4 versions of the Push-Button pre-series
i never heard of it
1-15 ? 2 piece front grille
til # 75 battery in engine room ,
up to #200, trunk opener in driver door post .
the last units has the trunk opener into the tailpanel ( pushbutton) like the later build Pantera's.
Also the later PB have a dash 2 ZF rear mount and 2 slot wheels .
Notice all the time differences , but a few early PB are also modified on restaurations to later build
Maybe I make a mistake , please correct me if I am wrong.