how can i get information of my iwc

hello every body
how can i get information of my iwc watch

its from my grand grandpa

the number ist 45 35 70

please send me at my email zangerlmarkus@hotmail.com

thanks

markus

Is that number on the case or on the movement? Are there spaces between the numbers? IWC serial numbers are like 453570.

If you have any photos, those also would help.