Caliber :EB 8381-67 Diameter: 33.5 mm./Excl.crown , Lug to lug height: 41.8mm. 

Lug space :18mm  Thickness: 10 mm

Name EB 8381-67

Manufacturer Ebauches Bettlach

Launch Year 1967

Caliber Family Description

10.5" :

8370: no second

8374: no second, date

8376: no second, day, date

8381: sweep second

8385: sweep second, date

8387: sweep second, day, date

11.5" :

8371: sub second, option: chronograph

8391: sweep second

8395: sweep second, date

8397: sweep second, day, date

8399: sweep second, skeletonized

extensions -66, -67 designate minor modifications and their year of introduction

Not all variants were actually made. Only those are listed, which are actually known or contained in current registers.

Related calibers

EB 8370, EB 8370-66, EB 8370-67, EB 8371-67, EB 8374, EB 8374-66, EB 8374-67, EB 8376, EB 8376-66, EB 8376-67, EB 8381, EB 8381-66, EB 8381-67, EB 8385, EB 8385-66, EB 8385-67, EB 8387, EB 8387-66, EB 8387-67, EB 8391, EB 8391-66, EB 8391-67, EB 8395, EB 8395-66, EB 8395-67, EB 8397, EB 8397-66, EB 8397-67, EB 8399-67

Is COSC certified No

Technical Details

Lignes Dimensions 10.5 ‴

Dimensions 23.69 mm

Height 3.9 mm

Further Measures Mounting Diameter (Dm): 23.3mm

Power Reserve 45 hours

Frequency 18,000 vph

Jewels 1

Complications and Specifications

Shape Round 

Complications

Sweep Second 

Regulator Type Pinned Regulator (or Index Regulator) 

Movement Type Manual 

Escapement Type Pin Lever 

Control Type Balance Wheel 

Winding Type Stem Winding 

Setting Type Stem Set 

Additional Information

Hand Sizes 1.50 x 0.70 x 0.18mm

Hand Count 3

Country Of Manufacture Switzerland

Notes Remarks: 1967-

pin-lever escapement

Other data: balance staff: U3110 stem: W3225 mainspring / battery: 1.50 x 10.0 x 0.12mm

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