Formex Reef 39.5 mmvsSeiko Prospex Sea 1965 Heritage Diver's Watch PADI Special Edition

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Measurements

Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Formex Reef 39.5 mm at true scale

Reef 39.5 mm

Seiko Prospex Sea 1965 Heritage Diver's Watch PADI Special Edition at true scale

Prospex Sea 1965 Heritage Diver's Watch PADI Special Edition

Diameter

39.5mm

40mm

Lug-to-Lug

45.5mm

lowest

46.4mm

Thickness

11mm

lowest

13mm

Water Resistance

300m

300m

Power Reserve

56h

72h

highest

MSRP

$2,230

$1,550

lowest

Movement

Sellita SW300-1

Seiko 6R55

Case

4 specs
Diameter
39.5mm
40mm
Thickness
11mm
13mm
Lug-to-Lug
45.5mm
46.4mm
Lug Width
22mm
20mm

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
Bahama Blue
n/a
Lume
Super-LumiNova
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Sellita SW300-1
Seiko 6R55
Power Reserve
56h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$2,230
$1,550
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Formex Reef 39.5 mm

The Formex Reef 39.5 mm is widely praised for its refined finishing, improved proportions, and compelling value under €2,000. Owners and reviewers highlight its comfortable wearability on smaller wrists, unique aesthetic, and impressive specifications including 300m water resistance and a COSC-certified Sellita SW300-1 movement. Some note the 22mm lug width feels slightly disproportionate and the bracelet could benefit from more taper. A prototype crown protrusion issue is expected to be resolved in production. Overall, owners rate the Formex Reef 39.5 mm highly for its excellent build quality and tool-like features at its price point.

Seiko Prospex Sea 1965 Heritage Diver's Watch PADI Special Edition

Owners and reviewers praise the Seiko Prospex Sea 1965 Heritage Diver's Watch PADI Special Edition for its attractive emerald green dial with a sunburst effect and gold accents, which looks gorgeous in the right light. The watch is noted for its retro-inspired design, domed sapphire crystal, and comfortable wearability, fitting well for some. The bracelet includes a new, slimmer clasp with toolless micro-adjustment, and the watch comes with both a steel bracelet and a fabric strap. However, some find the watch wears top-heavy due to its density and case design, and the bracelet clasp is criticized for its stamped parts and limited micro-adjustment. The retail price of €1,700 is considered high by some, with sales being recommended. On balance, owners and reviewers rate the Seiko Prospex Sea 1965 Heritage Diver's Watch PADI Special Edition positively for its attractive dial and comfortable retro design, despite some reservations about the clasp and price.

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