Bulova Series X 98B358vsCasio GMB2100GD-5A
lug2lug doesn't sell watches. Buy links open the brand's or seller's own site. Some links are affiliate links: lug2lug may earn a commission at no extra cost to you. Disclosures
Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Series X 98B358

GMB2100GD-5A
Diameter
45mm
44.4mm
Thickness
n/a
12.8mm
Water Resistance
300m
highest
200m
MSRP
n/a
$600
Movement
NN50
5691
Case
3 specsCrystal & Dial
1 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Bulova Black Dial EPDM Rubber Strap Series X 98B358 for its reliability and durability, noting its ability to withstand daily wear, accidental drops, and swimming. The quilted dial texture is a specific point of appreciation. However, owners are divided on the stock straps, with one owner expressing a strong dislike and considering strap replacement or a bracelet. The watch features a quartz NN50 movement, a 300m water resistance rating, and a 45mm case. Overall, owners rate the Bulova Black Dial EPDM Rubber Strap Series X 98B358 highly for its robust build and attractive dial, though strap preference varies.
Owners note the Casio GM-S2110BP-5A's strap gets dirty easily but cleans well, and the watch itself resists scratches during frequent wear. Some owners lament the lack of a positive display and find the lume could be brighter. A metal conversion kit is available, transforming the watch into a daily wearer. Overall, owners appreciate the Casio GM-S2110BP-5A for its scratch resistance and the potential for customization via modding kits.
Similar watches
Matched to the watches above on size, movement, style and price, microbrands first. Open any one to dig in.
Also compared
Comparisons nearby in the catalog: alternatives to the watches above paired against the matchup.








