by Synchron Store Admin


What does RS and IN exactly mean?

RS buckles are made of forged and hand finished in stainless steel
IN buckles are made of stamped and bead blasted stainless steel
DLC RS are made of forged and hand finished stainless steel with diamond like carbon (DLC) coating

Order on amazon
SKU: ISO520 Category:


Soft, durable and comfortable, possibly the best dive strap you’ll ever buy! Your strap comes complete with buckle and keepers, if you like to have additional spare keepers or buckles, please check the ISOfrane spare parts product category
A modern dive strap with the look and feel of the original ISOfrane straps of the 1960s – the ISOfrane 1968 strap
The RS buckle is a forged all stainless steel buckle with a screw pin, the name reflects the design and purpose of the design, the RS buckle resembles the original buckle on all isofrane straps from 1960s, made of solid stainless, the construction of the buckle features an added security feature, that holds the strap in place even if the straps comes loose out of the keepers.
Attention, all orders ship via Fedex priority to all destinations worldwide, shipping rates vary

Additional information

Weight 100 g
strap color

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choose the size of the strap according to the lugwidth of your watch

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Buckle Type

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Edwin Koopman 03/12/2019 at 8:58 AM

Dear all,

A few months ago I ordered a blue 20mm Isofrane strap in the color blue.
My remark then was that the color blue was more close to black than it was to blue.
Now I see the color “true blue”. Can you please tell me what the difference is between “blue” and “true blue”?
Maybe you can send me an image of both colours, just to compare. If “true blue” is really more blue, than I am very interested.


    Synchron Store Admin 03/12/2019 at 10:24 AM

    Hi, now tropic offers 3 shades of blue, from dark blue to true blue and royal blue, these are 3 shades of blue


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