The Elgin 721 watch movement features a mounting frame incorporating parts of the date assembly, positioned as the highest component. The movement incorporates an indirectly driven minute allowing for a large balance. It employs two barrels that are coupled in parallel to maximize space utilization. The movement, if equipped with 26 jewels, includes 5 hole jewels for the horizontal guide of the date disc and 4 cap jewels for the vertical guide. Additionally, the movement offers several functions such as manual wind, sweep seconds, day and date display (with day set by +/-24h), and calendar adjustment through a pusher at the 2 o'clock position.