This automatic chronograph watch from RGM features a 38.2mm diameter case in stainless steel. It is available in two dial versions: Black and Opaline.
The RGM Lancaster Chronograph Model #155 with black dial comes with blued steel hands where as the Opaline dial variant features rhodium finished hands. The hands and indexes are treated with luminescent coating.

This timepiece is equipped with the self-winding Valjoux 7750 movement. It displays chronograph 30 minute register at 12 o’clock, date at 3 o’clock (at 4.30 in some models), 12-h register at 6 o’clock and small seconds at 9 o’clock.

The RGM Lancaster Chronograph comes fitted on a leather strap or stainless steel bracelet.
Technical details
Model: RGM Lancaster Chronograph Model #155
Case
Stainless Steel
Sapphire Crystal
Sapphire Crystal Display Back
Diameter: 38.2mm
Thickness: 13mm
Dial
Black or Opaline
Applied luminous markers
Hands
Opaline Dial: Blued Steel Hands with Luminous
Black Dial: Rhodium with Luminous
Movement
Valjoux 7750 ( ETA ), High quality Balance, Hairspring, Escapement, & Mainspring, Ball bearing rotor axle, Bridges & Plates have Perlage & Cote de Geneve finish, 26 jewels, Automatic winding
Functions
Hour, Minute and Second
Date
Chronograph seconds, 30 minute timer, 12 hour timer
Strap
Leather strap or stainless steel bracelet
Stainless Steel Buckle
Width: 20mm x 18mm