This is turning out to be more longwinded than I thought, sorry guys!!
All these watches were purchased in Hong Kong in January 1985... that makes them 18 years old... and they are all still keeping good time, and one also measures the temperature too. So whatever I paid for them way back then was well invested. Now I suppose you are wondering what it is that is perplexing. Well in 1985 I weighed less than 2/3 of what I do now, but my watches all still fit and two of them have rigid bands with only a very small amount of room for expansion, maybe 2mm. So you might think I'd need them on the biggest setting, but no I wear them on the smallest setting. So with such a huge increase in my general body size, my wrist size has not changed in 18 years. I think that is really strange.