Parts interchange list from the Jules Borel website (http://www.julesborel.com)
WATCH MATERIAL INTERCHANGE LIST
721/1265 (discontinued)
BALANCE COMPLETE, INCABLOC
1327/OME 620
Price Each $
Price Each (3) $
BAL COMPLETES
OME 620 19,800 BPH
OME 630 SS-INCABLOC-19,800 BPH
OME 670 AUTOMATIC-SWEEP SECOND 17 JEWELS
OME 671 AUTOMATIC SWEEP SECOND 24 JEWELS
OME 672 19,800 BPH-24 JL-AUTO WITH OR WITHOUT SWEEP
OME 680 AUTOMATIC-CALENDAR-SWEEP SECOND-17 JEWELS-19,800 BPH
OME 681 AUTOMATIC CALENDAR SWEEP SECOND 24 JEWELS-19800 BPH
OME 682 19,800 BPH-24JL-AUTO-CAL-WITH OR WITHOUT SWEEP SECOND
TIS 2140 19,800 BPH-17 JL-INCA-ADJ STUD HOLD
Looks like the correct part to me.
Good luck finding one,
gatorcpa