Seiko NH72A

Seiko Instruments (TMI) · Automatic · Entry tier · Family: Seiko NH3x

Ruthenium-grey version of the skeletonised NH70A (data/movements/seiko-nh70.yaml) and the gilt NH71A; TMI lists the three together in its "Skeleton Mechanical (NH7)" range, and their spec sheets differ only in plating. TMI spec sheet (version 1, rev. 16.11.2022): 12 lignes, Ø27.40mm, 5.32mm high, "Three Hands (skeleton)", "Ruthenium grey plating", 24 jewels, accuracy -20 to +40 s/day (23 ±2 °C), manual winding, ball-bearing automatic winding in both directions, second-hand stop mechanism (hacking), 21,600 vph, duration "more than 41 hours", antimagnetic ≥4,800 A/m, "non-corresponding with diver's watch" casing. TMI product page: Côtes de Genève decorated rotor, ruthenium grey finish, country of origin "Japan or Malaysia". Built on the NH35 (NH3) framework like the NH70, hence the Seiko NH3x family.

Watches with the Seiko NH72A

Watch	Price from	Movement	Dia. mm	Thick mm	Crystal	Micro-adjust
Undone Aquadeep K9 Crystal (NH72)	$1,150	Seiko NH72A	43	—	Sapphire	no bracelet

Sources

• Time Module (TMI), NH72A watch movement specification and drawing (version 1, rev. 16.11.2022)
• Time Module (TMI), Skeleton Mechanical (NH7) product line-up