AVI-8 Bell X-1 Machbuster ChronographvsSeiko Prospex Speedtimer

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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.

AVI-8 Bell X-1 Machbuster Chronograph at true scale

Bell X-1 Machbuster Chronograph

Seiko Prospex Speedtimer at true scale

Prospex Speedtimer

Diameter

n/a

39mm

Lug-to-Lug

n/a

45.5mm

Thickness

n/a

13.3mm

Water Resistance

50m

100m

highest

MSRP

$300

lowest

$725

Movement

Quartz

Seiko V192

Case

6 specs
Diameter
n/a
39mm
Thickness
n/a
13.3mm
Lug-to-Lug
n/a
45.5mm
Lug Width
n/a
20mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
50m
100m

Crystal & Dial

5 specs
Crystal
Mineral
Sapphire
Crystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
Blue
n/a
Lume
None
LumiBrite on hands and index(es)

Movement

1 specs
Caliber
n/a
Seiko V192

Pricing

1 specs
MSRP
$300
$725
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Reviews

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

AVI-8 Bell X-1 Machbuster Chronograph

Owners widely praise the AVI-8 Bell X-1 Machbuster Chronograph for its aviation-inspired design, vibrant dial colors, and good value, especially when on sale. Some owners find the watch to be a stylish conversation starter with decent quality for its reasonable price, noting it holds up well for daily and outdoor use. However, the AVI-8 Bell X-1 Machbuster Chronograph is frequently described as chunky and thick, with some owners finding it too large and heavy. The lume is noted as pretty but not long-lasting, and some community members consider the branding derivative or cringey. On balance, owners appreciate the AVI-8 Bell X-1 Machbuster Chronograph for its unique designs and value, with the distinctive dial aesthetics being a primary draw.

Seiko Prospex Speedtimer

Owners widely praise the Seiko Prospex SPEEDTIMER for its vintage-inspired design and versatility as an everyday watch. Some owners find the 39mm case size comfortable and well-suited for active use. Reviewers note the solar-powered V192 movement offers a six-month power reserve. Criticisms include the watch's thickness, which some find to be between 13-15mm, and the 24-hour subdial. The price point is a recurring point of contention, with some owners questioning the value for a solar quartz chronograph. On balance, owners and reviewers find the Seiko Prospex SPEEDTIMER a capable and attractive watch, with its design being the most frequently cited positive attribute.

From video reviewers

The Seiko Prospex SPEEDTIMER's solar movement provides reliable power without battery replacements and accurate timekeeping, with a claimed accuracy of ±15 seconds per month. A notable trade-off is the watch's slightly thicker profile and somewhat lacking lume brightness. Reviewers disagree on whether the bezel action is smooth and clicky, with one reviewer praising it and the other not mentioning it.