Waltham Colonial Grade 1420 The Pocket Watch Database’s technical description of the movement based on its serial number Blued hands Full movement Balance cock, focus on the jewel Balance cock, focus on the regulator Balance wheel, focus on the impulse pin Movement with the balance removed Crown wheel Ratchet wheel Click Crown and ratchet wheels removed Barrel bridge removed Gear train bridge Gear train bridge removed, full gear train visible Mainspring barrel and anchor Centre wheel Third wheel Fourth wheel whose staff goes through the mainplate and carries the small seconds hand Movement with the escape wheel and Swiss lever left in place Escape wheel Swiss lever Dial side MInute wheel Cannon pinion Intermediate setting wheel and minute wheel visible Almost empty dial side