Side-by-side comparison of specifications and features
Compare visual case presence and physical footprint on one shared wrist. Measure your top-down wrist width for a stronger result; lug-to-lug is used when the catalog has it.
Medium (6.7″)
Estimated top width: 56.7 mm
Preliminary range: 54.7–61.8 mm.
Watch A
Visual presence
BoldCase covers 77% of your modeled wrist width.
Physical footprint
Near the edgeEstimated clearance: 2.8 mm per side.
Watch B
Visual presence
BoldCase covers 69% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 5.6 mm per side.
Proportional guide only: visual presence and physical footprint do not predict comfort. Weight, thickness, caseback shape, rigid lugs, strap stiffness, wrist-bone prominence, wearing tension, bezel design, and case curvature change how a watch actually wears.
Start with the specifications that meaningfully differ. Expand the complete table for reference details and missing-data context.
| Specification | Bulova Lunar Pilot | Seiko Prospex Speedtimer |
|---|---|---|
| Pricing | ||
| MSRPProspex Speedtimer is $25 less at MSRP | $750 | $725 |
| New PriceProspex Speedtimer is $82.3 less based on the current snapshot | $923 | $841 |
| Used Price (Low)Lunar Pilot is $77.9 less at the low end | $494 | $572 |
| Used Price (High) | $650 | $1,297 |
| 30-Day Trend | ↓ -24.1% | ↓ -51.7% |
| Used Price Range | $494 - $650 | $572 - $1,297 |
| Identity | ||
| Style | Chronograph, Tool, Sports | Chronograph, Sports |
| Dimensions | ||
| DiameterProspex Speedtimer is 4.5mm smaller | 43.5mm | 39mm |
| Thickness | N/A | 13.7mm |
| Lug to Lug | 51mm | 45.5mm |
| Movement | ||
| Movement | Quartz | Solar Powered |
| Case | ||
| Water ResistanceProspex Speedtimer adds 50m water resistance | 50m (swimming) | 100m (recreational diving) |
| Bezel | Fixed tachymeter | Tachymeter |
| Dial | ||
| Dial Color | Black | White |
1 field is excluded from the differences view because one watch lacks comparable data. Use “All specs” to inspect those gaps.
Bulova Lunar Pilot and Seiko Prospex Speedtimer can overlap on price or use case, but the buying decision usually comes down to mechanical feel versus low-maintenance convenience, wrist presence versus easier fit, water-ready utility versus dressier everyday wear. They both touch the chronograph and sports use case, so smaller spec differences can matter more than brand preference.
Bottom line
Fit is a real separator here — compare case width and lug-to-lug before deciding, especially if wrist comfort matters more than headline features. Choose Bulova Lunar Pilot if you prefer more dial presence and a larger case feel; choose Seiko Prospex Speedtimer if you want a smaller case footprint on the wrist.
Choose Bulova Lunar Pilot when
Bulova Lunar Pilot is a better fit for buyers who want more wrist presence, low-maintenance daily wear, chronograph styling.
Choose Seiko Prospex Speedtimer when
Seiko Prospex Speedtimer is a better fit for smaller wrists, low-maintenance daily wear, chronograph styling.
Movement and upkeep
Bulova Lunar Pilot: quartz movement
Seiko Prospex Speedtimer: solar movement
Bulova Lunar Pilot uses a quartz movement, while Seiko Prospex Speedtimer uses a solar movement — that changes day-to-day ownership, upkeep, and the overall feel on the wrist.
Size and wearability
Bulova Lunar Pilot: 43.5mm · L2L 51mm
Seiko Prospex Speedtimer: 39mm · L2L 45.5mm
Fit is a real separator here — compare case width and lug-to-lug before deciding, especially if wrist comfort matters more than headline features.
Water resistance
Bulova Lunar Pilot: 50m
Seiko Prospex Speedtimer: 100m
Water resistance is a meaningful separator here — the higher-rated option gives more flexibility for swimming or rougher daily use.
Price and value
Bulova Lunar Pilot: $599
Seiko Prospex Speedtimer: $626
These two often land in a similar price band — which usually means fit, features, and current deal quality matter more than the sticker price.
Style and use case
Bulova Lunar Pilot: chronograph
Seiko Prospex Speedtimer: chronograph
Both lean into a similar chronograph use case — the choice is more about fit, features, and price than category.
Crystal and materials
Bulova Lunar Pilot: sapphire crystal · steel
Seiko Prospex Speedtimer: sapphire crystal · steel
Materials are broadly similar, so finish, fit, and price will matter more than the materials list alone.
Bulova Lunar Pilot usually offers the lower entry price — confirm current listings because marketplace pricing can move quickly.
These two often land in a similar price band — which usually means fit, features, and current deal quality matter more than the sticker price.
Check current deals on Amazon and eBay using the buttons below — listing prices, seller quality, and condition can change quickly.
Prices change often, so compare the latest listings and condition options before you buy.
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Bulova Lunar Pilot
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Seiko Prospex Speedtimer
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Quartz and solar models are usually easier for grab-and-go use, while automatic and manual watches appeal more to buyers who enjoy the mechanical side of watch ownership.
Seiko Prospex Speedtimer — it is 45.5mm lug-to-lug versus 51mm, and lug-to-lug is what decides whether a watch overhangs a smaller wrist.
Seiko Prospex Speedtimer — it is rated 100m versus 50m, which is the difference between swimming confidently and only handling splashes.
Bulova Lunar Pilot is the value pick at roughly $27 less. Pay more only if a specific difference above matters to you — otherwise the cheaper one is the smarter buy. Confirm live listings, since marketplace pricing moves.
Evidence & Method
This page currently relies on normalized catalog fields and calculated differences. No external reviewer observation is used in its verdict.
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