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WatchCollectors.Org

Pocket Watch Size

This table can be used to convert a watch size from one system into another. Numbers that are in bold are exact, as are the inches and millimeters columns. Remember, this is a measure of the diameter of the movement, not the case.

 

Inches

Lancashire

Metric
(mm)

Ligne

Dennison

4.0000

85s

101.600

45

 

2.4000

37s

60.960

27

 

1.9333

23s

49.107

21

P

1.9000

22s

48.260

 

 

1.8750

20s

47.625

 

O

1.8667

20s

47.413

21

O

1.8429

19s

46.808

20

 

1.8333

19s

46.567

 

 

1.8206

 

46.244

20

N

1.8125

 

46.037

20

N

1.8000

18s

45.720

20

N

1.7762

17s

45.117

20

 

1.7667

17s

44.873

 

 

1.7540

 

44.553

19

M

1.7500

 

44.450

19

M

1.7318

16s

43.989

19

 

1.7096

16s

43.425

19

 

1.7000

16s

43.180

 

L

1.6875

 

42.862

19

L

1.6667

15s

42.333

18

 

1.6430

14s

41.733

18

 

1.6333

14s

41.487

 

K

1.6250

14s

41.275

18

K

1.6208

 

41.169

18

K

1.6000

13s

40.640

18

 

1.5764

12s

40.041

17

 

1.5667

12s

39.793

 

J

1.5625

12s

39.688

17

J

1.5542

 

39.477

17

J

1.5333

11s

38.947

17

 

1.5098

10s

38.349

17

I

1.5000

10s

38.100

 

I

1.4876

 

37.785

16

I

1.4667

9s

37.253

16

 

1.4432

8s

36.657

16

H

1.4375

8s

36.512

16

H

1.4333

8s

36.407

 

H

1.4210

 

36.093

16

 

1.4000

7s

35.560

15

 

1.3766

6s

34.965

15

G

1.3667

6s

34.713

 

G

1.3544

 

34.401

15

 

1.3333

5s

33.867

15

 

1.3125

 

33.337

14

F

1.3000

4s

33.020

 

F

1.2878

 

32.710

14

 

1.2667

3s

32.173

14

 

1.2500

 

31.750

14

E

1.2434

 

31.582

14

E

1.2333

2s

31.327

 

 

1.2212

 

31.018

13

 

1.2000

1s

30.480

13

D

1.1875

 

30.162

 

D

1.1768

 

29.890

13

D

Inches

Lancashire

Metric
(mm)

Ligne

Dennison

1.1667

0s

29.633

 

 

1.1546

 

29.326

13

 

1.1333

2/0s

28.787

12

C

1.1250

2/0s

28.575

12

C

1.1102

 

28.198

12

 

1.1000

3/0s

27.940

 

 

1.0879

 

27.634

12

 

1.0667

4/0s

27.093

12

B

1.0625

4/0s

26.987

12

B

1.0435

 

26.506

11

 

1.0333

5/0s

26.247

 

 

1.0213

 

25.942

11

 

1.0000

6/0s

25.400

11

A

0.9769

 

24.814

11

 

0.9667

7/0s

24.553

 

 

0.9547

 

24.250

10

 

0.9333

8/0s

23.707

10

 

0.9103

 

23.122

10

 

0.9000

9/0s

22.860

 

 

0.8881

 

22.558

10

 

0.8667

10/0s

22.013

9

 

0.8437

 

21.430

9

 

0.8333

11/0s

21.167

 

 

0.8215

 

20.866

9

 

0.8000

12/0s

20.320

9

 

0.7771

 

19.739

8

 

0.7667

13/0s

19.473

 

 

0.7549

 

19.175

8

 

0.7333

14/0s

18.627

8

 

0.7105

 

18.047

8

 

0.7000

15/0s

17.780

 

 

0.6883

 

17.483

7

 

0.6667

16/0s

16.933

7

 

0.6439

 

16.355

7

 

0.6333

17/0s

16.087

 

 

0.6217

 

15.791

7

 

0.6000

18/0s

15.240

6

 

0.5773

 

14.663

6

 

0.5667

19/0s

14.393

 

 

0.5551

 

14.099

6

 

0.5333

20/0s

13.547

6

 

0.5107

 

12.971

5

 

0.5000

21/0s

12.700

 

 

0.4885

 

12.407

5

 

0.4667

22/0s

11.853

5

 

0.4441

 

11.279

5

 

0.4333

23/0s

11.007

 

 

0.4219

 

10.715

4

 

0.4000

24/0s

10.160

4

 

0.3775

 

9.587

4

 

0.3667

25/0s

9.313

 

 

0.3552

 

9.023

4

 

0.3333

26/0s

8.467

3

 

0.3108

 

7.895

3