Pocket-Watch Size Table

Ever wondered how big a size 6 or an 18s is in proper money ?

This table can be used to convert a watch size from one system into another.
Remember, pocket-watches are measured by 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            21¾      P
1.9000     22s              48.260
1.8750     20s              47.625                        O
1.8667     20s              47.413            21        O
1.8429     19s              46.808            20¾
1.8333     19s              46.567
1.8206                        46.244            20½      N
1.8125                        46.037            20½      N
1.8000     18s              45.720            20¼      N
1.7762     17s              45.117            20
1.7667     17s              44.873
1.7540                        44.553            19¾      M
1.7500                        44.450            19¾      M
1.7318     16s              43.989            19½
1.7096     16s              43.425            19¼
1.7000     16s              43.180                          L
1.6875                        42.862            19          L
1.6667     15s              42.333            18¾
1.6430     14s              41.733             18½
1.6333     14s              41.487                           K
1.6250     14s              41.275             18¼       K
1.6208                        41.169             18¼       K
1.6000     13s              40.640             18
1.5764     12s              40.041             17¾
1.5667     12s              39.793                           J
1.5625     12s              39.688             17½       J
1.5542                        39.477             17½       J
1.5333     11s              38.947            17¼
1.5098     10s              38.349            17          I
1.5000     10s              38.100                          I
1.4876                        37.785             16¾       I
1.4667     9s                37.253             16½
1.4432     8s                36.657             16¼      H
1.4375     8s                36.512             16¼      H
1.4333     8s                36.407                          H
1.4210                        36.093             16
1.4000     7s                35.560             15¾
1.3766     6s                34.965             15½      G
1.3667     6s                34.713                          G
1.3544                        34.401              15¼
1.3333     5s                33.867             15
1.3125                        33.337              14¾      F
1.3000     4s                33.020                          F
1.2878                        32.710             14½
1.2667     3s                32.173              14¼
1.2500                        31.750             14         E
1.2434                        31.582             14         E
1.2333     2s                31.327
1.2212                        31.018             13¾
1.2000     1s               30.480              13½     D
1.1875                        30.162                         D
1.1768                        29.890             13¼     D
1.1667     0s                29.633
1.1546                        29.326             13
1.1333     2/0s             28.787             12¾     C
1.1250     2/0s             28.575             12¾     C
1.1102                        28.198              12½
1.1000     3/0s             27.940
1.0879                        27.634             12¼
1.0667     4/0s             27.093             12         B
1.0625     4/0s             26.987             12         B
1.0435                        26.506            11¾
1.0333     5/0s            26.247
1.0213                        25.942            11½
1.0000     6/0s            25.400             11¼     A
0.9769                        24.814            11
0.9667     7/0s            24.553
0.9547                       24.250             10¾
0.9333     8/0s            23.707             10½
0.9103                        23.122             10¼
0.9000     9/0s             22.860
0.8881                        22.558             10
0.8667     10/0s          22.013             9¾
0.8437                        21.430             9½
0.8333     11/0s          21.167
0.8215                       20.866             9¼
0.8000     12/0s          20.320            9
0.7771                       19.739             8¾
0.7667     13/0s         19.473
0.7549                       19.175            8½
0.7333     14/0s         18.627             8¼
0.7105                       18.047             8
0.7000     15/0s          17.780
0.6883                       17.483            7¾
0.6667     16/0s          16.933            7½
0.6439                       16.355             7¼
0.6333     17/0s         16.087
0.6217                       15.791             7
0.6000     18/0s          15.240            6¾
0.5773                       14.663            6½
0.5667     19/0s         14.393
0.5551                       14.099            6¼
0.5333     20/0s         13.547             6
0.5107                       12.971           5¾
0.5000     21/0s         12.700
0.4885                       12.407           5½
0.4667     22/0s          11.853           5¼
0.4441                       11.279            5
0.4333     23/0s          11.007
0.4219                       10.715           4¾
0.4000     24/0s          10.160           4½
0.3775                        9.587            4¼
0.3667     25/0s           9.313
0.3552                        9.023             4
0.3333     26/0s           8.467            3¾
0.3108                       7.895              3½