From a green SPRD to a Batman GMT in a few very simple mods. I already had a domed crystal, which is a must. The NH34 can be had for ~$60 or less if you’re patient, ceramic 24 hour bezel ~$18, GMT hand ~$8, I used the original hands but had to slightly tweak the hour hand to make it tighter. Only hard part is stacking the hands so they don’t touch as they sweep.
I’ve worn watches my whole life with some Rolexs bought 40 years ago when an average employed guy could afford them and Seikos a Timex or two long gone. Nothing special until I recently got a little m...