Hamilton H13519561 American Classic Boulton MechanicalProduct Overview The new "Bolton Mecha" combines Art Deco and American Classic styles. The curvaceous case form of the "Bolton" has been loved since its release in 1940. While maintaining its classical appearance, it is equipped with Hamilton's latest hand wound movement, the H 50. This is a timeless design that does not fade with time. Specifications Product Number H13519561 Caliber H 50 Collection American Classic Movement Mechanical Case Size 34mm