Old Watches

My dads boss gave these old watches to him years ago and my dad passed away and left them to my mom. They have been sitting in a coffee can as long as I can remember. I don't think they all keep correct time but one or two might. Im not sure of the values because I have no knowledge about watches but someday when I get some free time I will try to do some research on them. Ive been told that there is ID numbers on the insides. Im afraid if I pry them open I may damage them.