Does anyone know if this band is originally made by ROLEX?

[FAU1966]

Hi, I just bought this watch from a friend, The model is 1800, and the serial is 81XXXX (1962) , Someone put a saphire glass(non-original) on it (I put back an original plastic glass) , and the dial is re-made, any way , I opened and it is original. I sold the watch with a regular gold bracalet, but I kept the band that it had on. Can any one know if its originaly made from ROLEX, I saw one just like it for sale from a Premium seller on ebay, at a huge price, the small crown is missing but with lens you can see it was there (I guess it broke), the diamonds are princess cut and they are very clean, do anyone has an idea of the price?, please forgive the bad quality of the pictures. Any help will be appreciated.

thanks