How do I date a Benson watch?

FACTORY / HOUSE: J.W. Benson Jewelers STYLE / REFERENCE: Covered Trench Shrapnel / Campaign Series METAL / MATERIAL: Nickel Silver CIRCA / YEAR: 1915 DIMENSIONS / SIZE: Length 41mm x Diameter 35mm MOVEMENT / CALIBER: Manual Winding / 15 Jewels DIAL / HANDS: Kiln Fired Enamel with Luminous Numerals / Blued Steel Luminous Hands ATTACHMENT / LENGTH: Leather 12mm / Regular Length WARRANTY: 18 months on the movement LIFETIME SERVICE COMMITMENT This rare example of a true trench watch was originally sold by the legendary house of J.W. Benson in London. Benson's were the jewelers to all the British...

J.W. Benson. A Heavy 18ct Gold Half Hunter Minute Repeater Keyless Lever Pocket Watch with a Heavy 18ct Gold Albert Watch Chain C1895. Dial:The excellent white enamel dial with Roma...

FACTORY / HOUSE: J. W. Benson STYLE / REFERENCE: Art Deco / Reference 032K METAL / MATERIAL: Nickel CIRCA / YEAR: 1930's DIMENSIONS / SIZE: 32mm Length X 32mm Diameter MOVEMENT / CALIBER: Manual Winding / 15 Jewels DIAL / HANDS: Factory Original Kiln Fired Enamel Dial with Blued Steel Hands ATTACHMENT / LENGTH: Leather, 16mm / Regular Length WARRANTY: 18 months on the movement LIFETIME SERVICE COMMITMENT The J.W. Benson watch...

FACTORY / HOUSE: J.W.Benson London STYLE / REFERENCE: Half Hunters Case METAL / MATERIAL: Sterling Silver CIRCA: 1890's DIMENSIONS: Diameter 39mm MOVEMENT / CALIBER: Manual Winding / 13 Jewels DIAL / HANDS: Original Kiln Fired Enamel with Roman Numerals / Original Blued Steel Hands WARRANTY: 18 months on the movement. LIFETIME SERVICE COMMITMENT This great looking and all original pocket watch was produced by the legendary house of J.W. Benson. They were the jewelers to the royal family and everything they produced was made of the finest materials and craftsmanship. The cover is engraved and filled with enamel and fired in a furnace. The original dial is in flawless condition without any chips or hairlines and was also fired in a furnace. The movement is high grade and produced in Switzerland for Benson and the case is hallmarked with English stamps...

FACTORY / HOUSE: J.W. Benson STYLE / REFERENCE: Trench Watch / Campaign Style METAL / MATERIAL: Sterling Silver CIRCA / YEAR: 1915 DIMENSIONS / SIZE: Length 32mm X Diameter 27mm MOVE...

FACTORY / HOUSE: J.W.Benson London STYLE / REFERENCE: Half Hunters Case METAL / MATERIAL: Sterling Silver CIRCA: 1890's DIMENSIONS: Diameter 39mm MOVEMENT / CALIBER: Manual Winding / 13 Jewels DIAL / HANDS: Original Kiln Fired Enamel with Roman Numerals / Original Blued Steel Hands WARRANTY: 18 months on the movement. LIFETIME SERVICE COMMITMENT This great looking and all original pocket watch was produced by the legendary house of J.W. Benson. They were the jewelers to the royal family and everything they produced was made of the finest materials and craftsmanship. The cover is engraved and filled with enamel and fired in a furnace. The original dial is in flawless condition without any chips or hairlines and was also fired in a furnace. The movement is high grade and produced in Switzerland for Benson and the case is hallmarked with English stamps...