Good spotting Dick. A better detail of the logo follows, along with the 'actuator'. The actuator is actually part of the switch itself, rather than an 'add on'. I'd call it a button head plastic actuator.
There is nothing molded on the other side of the switch.
You can easily rotate the 'W' with 'R' or 'L' in Irfanview, but neither way really looks like a '3' or an 'E'. Nor as an 'M' if it is turned over. 'W' is my choice also. Digikey list Wurst as a manufacturer, but there are over 800 options without refining too much. And I can't find their logo.
It's Saturday morning Down Under and my SDA wife is gone to church. We're going out this evening but she'll be 'back to work' tomorrow and I use her younger and less abused eyesight to do the chores I can no longer see well enough. With a magnifying glass I believe I can see the tabs to which you refer, so perhaps a dress pin will fit in to unlatch them. Photo attached. I have nothing to lose. Will let you know how I make out.
Thanks!
Bob M