And if you have decided to buy it (which I strongly advise), then you should look for a different color: There are price differences of up to 30 euros for the same clock.
If you do not get the bracelet in the color that you would like; For the price difference, there are 3 bracelets.
The port width is 23 mm which is extremely rare (search for "bracelet 23mm" in category "Clocks"). However, currently is at Amazon anything suitable, except an overpriced offer from Kautchuk of Armani for 50 Euro. 22mm make it even if one accepts 0.5mm game.
However, the original has a "circular connection" and those bracelets made of silicone are also extremely rare.
I suspect that Citizen wants to do later with expensive parts for these clock checkout. One should keep in mind so!