Calibers
Ronda 715
I cleaned up a watch for a friend, and it turns out to have had a quartz Ronda 715 movement. In my research, I learned it's a fairly easy movement to disassemble and reassemble, so I grabbed an extra movement to practice with.
Seiko NH35A
| NH Movement | In-House Name | Caliber Corner | Key Features and Differences |
|---|---|---|---|
| NH34 | 4R34 | NH34 | GMT function with additional 24-hour hand for dual time zones, date complication; ideal for travel watches. |
| NH35 | 4R35 | NH35 | Standard three-hand movement with date display; no day or GMT; widely used in entry-level automatics. |
| NH36 | 4R36 | NH36 | Three-hand movement with day and date display; adds weekday functionality over NH35. |
| NH37 | 4R37 | NH37 | Three-hand movement with date and 24-hour subdial; no day display; suited for watches needing extended time tracking. |
| NH38 | 4R38 | NH38 | Basic three-hand movement with no date or day; compatible with open-heart (skeletonized dial) designs for viewing the balance wheel. |
| NH39 | 4R39 | NH39 | Three-hand movement with no date or day, includes 24-hour subdial; often used in open-heart or decorative watches. |
| NH70 | None (variant of NH35) | NH70 | Fully skeletonized three-hand movement; no date; decorative with visible mechanics, nickel-coated. |
| NH71 | None (variant of NH35) | NH71 | Skeletonized like NH70 but with gold-plated finish; cosmetic upgrade for open-dial watches. |
This is part of a family of movements; these are the "third party" variants of in-house movements.
Sellita SW200/SW200-1
This is the movement I am most interested in building watches around.