ISA 8181 Exploded diagram Brand ISA Caliber 8181 Size 11 1/2 Function Version Hands 0.90x1.50x0.20/0.16 Stem = 815 (eigen) Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery 395 Movements Artno.brandcaliberSizehandsfunctionspecialISA818111 1/20.90x1.50x0.20/0.16SC-CHR167975ISA8171/20111 1/20.90x1.50x0.20/0.16SC-D(6) BIGDATE-CHR 1/5S2 EYES ( 2-10 ),60S@2, 30M@10167978ISA8171.20211 1/20.90x1.50x0.20/0.16SC-D(4V)-TG(Z)-CHR 1/5S3 EYES ( 2-6-10 ),60S@2, 30M@10, DAY@6167974ISA8172.22011 1/20.90x1.50x0.20/0.16SC-D(4H)-TG(Z)-CHR1/5S3 EYES ( 2-6-10 ),60S@2, 30M@10, DAY@6 WatchpartsPart NocaliberdescriptionoriginalArtno.401= 815Winding stem943004018154401Bridle (+)9430440181614405Battery connection upper943044058161