Casio M5610U with a metal mod I picked up for $99 and I love it! Pick up and go with never a care for durability or accuracy. World time across 5 presets, that you can swap back and forth with your home time at a press of buttons, solar powered, and radio receiving for auto updating of time and date.
What's your cheapest watch in your collection?
https://preview.redd.it/7oc3rme8x5wb1.jpeg?width=1232&format=pjpg&auto=webp&s=4130056da6df31abef6de0315cd3f9e4458346d4
$16 from Walmart. Then adapters and a NATO.