Murph,
MST had a limited number still in original packaging, boxes in some cases, labels only in others. These were sawn many years ago. There are some newer stones, quarried a long time ago and recently sawn without labels. I have a few of those here now, some nera perfect other with tiny chips, slight color variants, etc... they hone very nicely. Mine are always honed and rounded before sale though.

The Toolshop stone sounds like those from the other Muller, not MST.

Tony