Seiko Automatic Movements for Mod Builds

Seiko (TMI) Automatic Movements for Mod Builds

Every movement here is a Seiko (TMI) automatic with hacking and hand-winding, running at 21,600vph with 24 jewels. Each comes with one uncut stem and a grey movement spacer, and the NH34, NH35 and NH36 are sold unregulated.

Choose a Movement

• NH35A: for dials with a date-only window, with a white or black date wheel.
• NH36A: day and date, in a version for a 3 o'clock crown case and a version for a 3.8 o'clock crown case, each with a white or black day/date disc. The 3.8 o'clock version fits the SKX007 and SRP Turtle cases with a 4 o'clock crown.
• NH38A: no date and no day, with an open heart that shows the escapement.
• NH34A GMT: the GMT movement, for a GMT hand. Its page lists the sapphire crystals we recommend for an NH34 build.
• NH71: a skeleton movement.

Building Around Your Movement

Choose hands from the hands for the NH movement, with GMT hands for the NH34, and a dial. For an NH34 build on an SRPE, see the SRPE GMT modification parts.

Frequently Asked Questions

What's the difference between the NH35 and NH36?

The NH35 is for dials with a date-only window. The NH36 shows the day and date, and comes in a version for a 3 o'clock crown case and one for a 3.8 o'clock crown case.

Which NH36 do I need?

The one that matches your case's crown: the 3 o'clock version or the 3.8 o'clock version. The 3.8 o'clock version fits the SKX007 and SRP Turtle cases with a 4 o'clock crown.

What comes with the movement?

One uncut stem and a grey movement spacer. The NH34, NH35 and NH36 are sold unregulated.

Which movement is for a GMT build?

The NH34A GMT movement. Pair it with a GMT hand made for the NH34.

Browse the movements above to find the one for your build.