One of two staffs used on these 18 models, the other staff is the 4860.ĭimension: A 5.41 mm, B 2.68 mm, F 0.94 mm, G 0.92 mm, H 0.61 mmįor 16 Size 18 Models, Factory Staff Number 4860, Description: Patent Detachable Straight Shoulder, Square Hub, Pivot 12. 1883 Large hole balance wheels take staff 1364 with a 2.00 waist.įor 16 Size 1899, 19, 1945, 1947 Models "A", Factory Staff Number 4861, Description:Detachable Taper Shoulder, Regular, Pivot 12. *Small 1.80 mm waist for 18s 1883's with small hole balance wheels. This is the 5.69 mm length short version of the 18 size Model 92 staff.ĭimension: A 5.69 mm, B 3.15 mm, F 0.92 mm, G 1.25 mm, H 0.62 mmġ8 Size for 1883 Model Factory Staff Number 1365, Description: Regular, Small Waist 1.80 mm diameter*, Pivot 12Īlso same as Factory #987 used in 18 size 18 modelsĭimension: A 5.84 mm, B 3.5 mm, F 0.91 mm, G 1.23 mm, H 0.61 mm Staff Measurements Explanation A = Overall Height (Length) B = Distance from Roller Seat to Pivot F = Hairspring Collect Hole G = Balance Arm Hole H = Roller Holeġ8 Size Factory #1703, 1892 Model also Factory #28210, Description: Vanguard, Royal and Riverside Grades all use this staff, plus 8 day auto clock.
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