bracelet is typical crappy mbk one, lugs have the high shoulders like mbk, crown guards outside havnt been trimmed so they have the wide large mbk ones, serial number is typical mbk one used.
if it were a yuki case the rear profile of the crown guards would be different and the crown position would be correct. the crown position on this one is lower than it should be because its made for ETA which mbk cases use, yuki cases have the correct high -above center position because they are designed for rolex movements. dial is mbk and this case wont fit a gen sized 1680 dial.
even if the crown is gen, its the modern 703, not appropriate for this watch, and the movement is high beat.