Ok, it's SMKs. Confirmed. Ah well, at least I get to try these supposedly very good switches. It's a Chicony KB-5181 which I got for $25, plus I picked up an AT->PS/2 converter for $2.85. Depending on how I like it it might replace my Model M for my workshop rig. Slightly heavier MX blues with a softer landing sound divine and good contenders against buckling springs.