12”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• In some movement catalogs, the Smiths 400 is also listed as caliber 12.xx (12 = diameter in lines, xx = number of jewels) and the version with center seconds as 27.CS (27 = diameter in mm). Presumably Smiths itself changed the designations over the course of time
• Movement family:
  • Smiths 400 / 12.15: small seconds, 15 jewels, standard version
  • Smiths 400 / 12.16: small seconds, 16 jewels, exclusively for J. W. Benson
  • Smiths 400 / 12.18: small seconds, 18 jewels
  • Smiths 27.CS: sweeping seconds, 17 jewels

• Listing ID: 19193
• Manufacturer / Brand: Smiths
• Caliber: 400 / 12.18
• Size in French Lignes: 12'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 18
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1955
• Country: United Kingdom
• Identification: Shown in the book by Barrie Smith: Smiths Watches, Perhead Publication Ltd, 2009 as caliber 400.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)