Currently got this one on my work laptop. Model M terminal board with internal converter. The only layout changes I made versus a normal 102-key are that RCtrl is is a Windows key, and the four keys along the right side of the numpad are =, -, +, and the normal Enter.
That thing will survive a nuclear war...
Want to know the crazy part? This is the version after TWO rounds of value-engineering. The Model B and Model F are both a good bit more robust than these Model M's, and these last forever. The older boards are more rare due to less compatibility and a smaller computer market in general when they were released.