great find Neil - very nice piece indeed.
As you'll know, these comports/stands were popular around this time, and the pressed glass Rd. designs show lots of rims decorated with Greek Keys, beads and mitre splits like this cut example.
MW registered quite a few pressed designs with these features, although having looked through my Kew images for the 1860's I was unable to see any pieces (from MW) showing what looks vaguely like this Celtic/Norse interlocking belt pattern - which I assume is cut, as might be the knop on yours.
Unlike the keys and beads etc., this particular pattern looks to be quite rare.
However, something I thought a coincidence - and perhaps a case of plagiarism (by someone) - is the fact that James Derbyshire & Bro. appear to have Registered a design for a footed basin of sorts, with this same interlocking pattern, plus mitre splits on the rim, in December 1864 - No. 182248.
Their name doesn't appear on the drawing sent to the B. of T., whereas MW's name almost always does appear, but I've checked Slack and Thompson and this is definitely a JD No.
If it's of any interest, I can add Kew pix of MW designs that might be thought to be related to your comport/stand.