AS 1158, Main spring, no: 770
- Manufacturer: Prima, no: 160 M 28
- Fits AS cal:
- 984, 1002, 1007, 1009, 1010, 1013, 1015, 1021, 1024, 1027, 1028, 1029, 1032, 1033
- 1035, 1038, 1041, 1043, 1044, 1048, 1050, 1055, 1077, 1084, 1089, 1091, 1113, 1114
- 1118, 1120, 1123, 1124, 1128, 1135, 1141, 1147, 1153, 1154, 1158, 1160, 1161, 1166
- 1178, 1187, 1190, 1194, 1200, 1201, 1202, 1211, 1214, 1218, 1219, 1230, 1231, 1237
- 1238, 1245, 1247, 1248, 1249, 1252, 1259, 1264, 1269, 1277, 1285, 1288, 1356, 1686
- H: 1,60
- D: 9
- F: 0,105
- L: 280