Ok, I've had a reply to my message.
Hi
If the rest of your stock has the possibility of being the same as this one then it might be a good idea to have a look at them; it's definitely a homemade strap. I can probably blag it with my boy until the strap breaks which is going to be very soon as it's hanging on by a thread at the moment. I am not happy with the price though; if we can do something about that, I'll rig up a new strap for him and we'll leave it at that.
Now I have opened one and the strap is in fact a piece of eleastic with velcro either end. You thread it through the back of the watch and it does the job. Does anyone know if this is the correct strap to have with this watch. I think it is and the customer has been looking at the more expensive watches which have proper straps. What I found interesting is that he's now offered to keep the watch if we can negotiate on price
I'll just tell him to keep it with my best wishes.
cheers,
Anthony