Casio] databank, had to swap out the strap as the included metal one broke. I love the little LED is has for nighttime use, the best of my calculator watches. : r/JapaneseWatches
Casio E-Databank EDB-100CJ-2A Watch Band Strap 18mm Blue Rubber NOS Or | watchonom
Casio Databank - Wikipedia
Casio Stainless Steel Watch Bracelet for DBC-611, DBC-800, and DBC-810