So recently my old wmo 1.1a i had for a few years now had issues with the left click. I've retired it for now until I upgrade it. So i saw a new wmo on ebay for $12 shipped from the usa. New old stock. Seems legit to me, runs with the 500mhz driver fine. Anyways. the production dates are very close. I can't tell if it's 2003 or 2005. My other is 0303 so that's 2003 either way. anyway here's a photo. My main concern is whether or not i got an avago sensor instead of the superior MLT-04. the brand new one is on the right. You can see the marking differences yourself. I'll have to assume it's of 2005 production due to the differences.