Your watch and watchband is connected by two spring bars. The standard spring bars you can find normally are in straight form. However, according to design criteria, some watch case may be designed with a tiny little end to holds the spring bars. The space between watchbands will be narrowed down.
In such case straight spring bars may not be fixed firmly or even cannot be inserted. The smart designers will change straight one to a pair of curved spring bars in order to increase the space between spring bars and watch case.
On the other hand, by using curved spring bars, watch strap end will be slightly forced to follow the curve outline of watch case. It does narrow down the embarrassing lug gap. This applies to non-rigid material, such as leather watch strap. The changing of curved spring bars does create more rooms to fit in a watch band. There are of benefit to you when installing the watchband, it became easy and also help to prevent the damage of watch band from scrapping when you pull in and out a NATO style straps.
Here are some curved end watch straps and leather straps with curved spring bars demo on IWC Portuguese Annual Calendar Midnight Blue Dial IW503502.
22mm CrocoCalf (Croco Grain) Dark Blue Semi-Curved Watch strap, Blue Stitching, P
[Left] 22mm CrocoCalf (Croco Grain) Dark Brown Semi-Curved Lug Roller Deployant Watch strap, Golden Brown Stitching P [CGD2218P13GB060-XX]
[Right] 22mm Dark Grey CrocoCalf (Croco Grain) Deployant Watch strap, in Blue Stitching, PVD [CGD2218D13NB062-XX]
These elegant crococalf – Croco Grain embossed crocodile’s square grain which looks like the real thing but only cost in a calf leather watch strap.
Below these two are accompanied with solid 316L stainless steel push button type Roller deployant clasp (butterfly deployment buckle).
[Left] 22mm MiLTAT Navy Blue Genuine Nubuck Leather Watch Strap, Beige Stitching, Polished Buckle [22P20PBU57S6B20-XX]
[Right] 22mm MiLTAT Saddle Brown Genuine Nubuck Leather Watch Strap, Beige Stitching, PVD Buckle [22P20DBU57S6D17-XX]
These Italian Nubuck leather watch bands have rubbed surface, giving out a touch similar to suede but more strong. Vintage mood strongly enhanced by gradually diffused smoky effect, created by free hand painted black edge lacquer sealant. Featured in cut strap with stitching at lug end and tip of strap.
22mm MiLTAT Horween Chromexcel Watch Strap, Blackish Green, Grey Stitching
Horween Chromexcel Leather is characterized by a rich pull-up in full aniline, hand rubbed finishes, offers the ultimate in comfort and durability. This vintage looks watch band featured in cut strap with raw edge, stitching at lug end and tip of strap. Pull up Aniline Italian calf leather lining adds a level of comfort to your wrist.
22mm MiLTAT Black Genuine Calf Leather Watch Strap, Beige Stitching, Polished Buckle
This vintage looks Italian leather watch band featured in cut strap with stitching at lug end and tip of strap. Matte clear edge lacquer strong sealant was applied, to lower the risk of cracking and peeling when cured with no disturb on the simplicity of design. Luxury leather watch band like this one is using the same top layer leather as lining too. The fine leather is soft but durable, also added a level of comfort to your wrist.
22mm MiLTAT Horween Chromexcel Watch Strap, Matte Brown, Military Green Stitching
Horween Chromexcel Leather is characterized by a rich pull-up in full aniline, hand rubbed finishes, offers the ultimate in comfort and durability. This vintage looks watch band featured in cut strap with raw edge, stitching at lug end and tip of strap.
Related to spring bars video:
Video about “How to select the correct spring bars”
The following is Video of spring bar details
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