The easiest thing to do with plates and bridges is to cement them to another larger brass plate, then center this in the faceplate. The centering can be checked with a wobble stick or optically with a scope.
Back in days of mechanical watches, the market for ETA was so huge that the brand couldn't have possibly done without producing variety of grades in Asia.
Production is Asia doesn't mean fake or replica, though inferior quality to swiss made ones of the same category . Most any low to mid range priced ETA is mixture of parts from different manufacturers, so where do you draw the line to distinguish between genuine ,Asian made etc.
Watchmaker got a solid point though, that shock spring .
More "not quite a Bulova" fun on its way from the penny lots. The auction claims it is "working", other than the missing crystal, so there is a reasonable chance that the balance is whole. Time will tell.
It looks like there may be an issue with the date wheel, and the dial will need some very careful cleaning too. Lets hope the seller packs it sensibly and doesn't damage the hands.