the fact that it says 1680 between the lugs and not 5513 means its not the older style case. the rear cgs are also different than the usual squared type i get, date mag, caseback and lug thickness also looks different. also the endlinks that come with the mbks were open springbar, yours are closed. dial and crown look typical, insert is slightly different. i believe this is the new one, you must request they build you the old style. get some more bracelet shots, im intrigued by these endlinks. also hope your movement doesnt gum up next week as mbk is notorious for having this problem but it seems to mostly effect no date subs. serial # sounds good, but like alli' said try fitting gen parts, who knows maybe this is a new hybrid (doubtful)