No WM, but I have:

EM, SS, LJ, MH, and KM on Fortune Club and Nevada Club matches.

I've kind of stopped picking these up as obviously there is no "complete collection" of monograms.

I also have a couple that were obviously intended to be monogrammed, but are blank. I'm saving these to trade at a premium as 'blank matches', for when the Casino Match Chapter gets as organized as the Slot Card Chapter [g].