Hamilton 992B 16S Mainspring (Double Brace)

Genuine Generale Ressorts Swiss-made replacement mainspring for Hamilton 992B and related 16-size pocket watch movements using the DB (Double Brace) mainspring configuration. 

The Hamilton 992B is one of the best-known American railroad-grade pocket watch movements. Produced in large numbers over several decades, the 21-jewel 992B was built to meet demanding railroad timekeeping standards and remains extremely popular with collectors, hobbyists and professional watchmakers today. Its quality, historical importance and large surviving population make the 992B a movement well worth maintaining and servicing.

If you’re servicing a Hamilton 992B movement, you might find that some dusty old Hamilton NOS mainsprings or similar aftermarket springs from that time period are available. But if you're going to take the trouble to service a great vintage Hamilton watch it's best to use a modern, quality mainspring like this product by Generale Ressorts of Switzerland.

Is GR7165DB compatible with the Hamilton 992B?

Yes. GR7165DB is a replacement mainspring for the Hamilton 992B using the DB (Double Brace) mainspring and barrel configuration. The DB outer end has two braces designed to engage the appropriate barrel configuration.

Important: Vintage pocket watch movements may be encountered with different replacement barrels or mainspring configurations after decades of previous servicing. Compare the existing mainspring, dimensions and barrel attachment before ordering.

Compatible Hamilton Movements

992B
16S
604

Specifications

Manufacturer: Generale Ressorts
Manufacturer Part Number: GR7165DB
Type: Manual-wind mainspring, DB (Double Brace) end
Height: 3.00 mm
Thickness: 0.165 mm
Length: 740 mm
Barrel Diameter: 16.5 mm

Amplitude Watch Parts ships from the USA, so there’s no need to worry about long shipping delays or tariffs.