Seekins 30mm low rings. These are the vortex precision match rings that are the Seekins USA made ones rebranded vortex. They are brand new with packaging. 115$ tyd pm for pics if link doesn’t work.
You are correct: they are the .87 height Seekins rings/vortexJust FYI Seekins 30mm low rings are .82", these correspond to a Seekins medium ring height.