[Back when it was King Chain] The Diamond XL/XDL chains have a fully press-on type of sideplate, which is also held on with a flush-closing clip. The press-on portion of this chain requires having an extra sideplate to stack on top of the link's sideplate. You first press the sideplate into seating location (there's a step on the shafts of the masterlink's pegs, with the nubs above the clip portion slightly smaller OD than the link's pins) and then, using needle-nose or [genuine] Honda toolkit pliers, you install the clip until it's open ends meet over both pins. It's a truly bulletproof masterlink, being as strong as the others (which normally isn't the case). In my book there is a picture of a screwdriver pointing to just such a masterlink, minus the clip, that had been ridden for quite some miles (days) before it came to me: even then the link plate still had to be pressed off with a link tool!
I have recently installed several new chains from [modern day] RK, some knockoffs of the Diamond (not nearly as good) and Tsubaki, but have not found such a strong masterlink in them. What other brands have a link like this one today? Anyone?