Great looking with patina.
I guess it is 36mm or less with 18mm strap!

 

It's very rare to find young people now who appreciate horology.. probably it's the young age interest af rather dinamic objects like smartphones. We have had electronic devices when we were kids to but definitely not that bright.
For my son, im intending to get him a foot in mechanic watches on his next birthday, most probably swatch sistem51.