Dear All,
I hope you are well. My name is Mat and writing you to request some help to find any information about a particular watch. My Grandfather died on 2010 when he was 99 years old (He was born in 1911). I have inherited some things from him and one of those is his watch. My mother gave me this watch some years ago. Now I am looking for some information about it. He used to use this watch every day, and I think he had replaced the original strap by this expandable one, because he used to said it was more confortable for him. The number at the bottom is 841522, it has a hand-winding mechanism and it is still working properly.
Here in this post, there are attached 20 pictures of this watch.

I really appreciate it any information about this watch that you can let me know.
Thanks in advance
I am looking forward to hearing from you
Best regards

Mat