Ordered the 5610-1 with the older 3159 module, received the 5610U-1CF with the newer 3495 module. I'm not complaining, and I only paid $90 👍 : r/ gshock
CASIO gw-m5610 black 3159 G-SHOCK 549311 | eBay
CASIO 3159 G-Shock Watch User Guide
格安SALEスタート】 美品 CASIO G-SHOCK ブラック JA 3159 腕時計(デジタル) - invictusgrowth.com
G-Shock Module 3159 Watch Movement | Caliber Corner