Also was considering the (still German made?) Weller WSD51 for a while.
COO = Mexico for the WES51 and WESD51.
The WD, WR, and WX series' are made in Germany*.
* "Made in Germany" = 20% minimum content and/or what they call significant transformation. I mention this, as my WD1's boards were made by Asian contract manufacturers. The enclosure, iron, stand, and final assembly was actually made and performed respectively in Germany.