How to open these pins?

[PJA]

Hello there. It's the first time I came across this type of pins in the strap, and although I didn't need to remove the strap I was wondering how to go about it. Is this need to be unscrewed or some sort of other technique?

[wls1971]

These type of pins can either have screw in ends or friction fit push in ends if its a cheap quartz type watch I would guess they are the friction fit type and the ends should just pull out.

[PJA]

Yup, it's a cheap Chinese wrist watch. Thank you.