BabyLock, Simplicity Serger Upper Looper Fits Models: 
BL4-428, BL4-428D, BL4-436, BL4-428NS, BL4-436DF, BL4-714, BL4-728, BL4-728D, BL4-736, BL4-736D, BL4-738, BL4-738D, BL4-738NS, BL4-838D, BL5380ED, Simplicity SL880, SL880D

714-6101-01A