Recent find - Alexander Girard table - looking for info  

ZooMob - I cannot answer any of your questions, but I wanted to congratulate you on this find. Well done 🙂

Rare? There are seven listings on 1stDibs at the moment. The one I clicked on had a 20" square marble top, presumed to be original. I didn't open any of the other listings to check dimensions but it's easy enough to do.
eta: sorry, missed the part about the thickness and radius of the rounded corners. The thickness looks like the same as the cross piece in the center of the legs. I would figure the radius of the corners by drawing it on paper and comparing. Actually, I'd put a round top on it if that is correct--one of them had a round top on the site above. I just prefer that look.

What you found at the thrift is not an Alexander Girard table, but a Girard designed base. As you correctly surmised, the white laminate top does not belong on the base. It's most likely what I call an "employee cobble-job". We have seen many pieces which were made by employees of Herman Miller who took parts from furniture that was in production and combined them or modified them to suit their needs or to just make use of the parts which were lying about. For example, we've seen Nelson tables with Eames legs attached, and we have seen a lot of case goods which were turned into storage for employees' garages or basements. It looks like someone took a spare Girard base and stuck a loose laminate top on it. While technically not a "Girard table" per se, it is still cool to find it cheap in a thrift store.
I don’t think I would consider it “exceptionally rare”, though it is far less common than most vintage Herman Miller. I’m sure you know that the Girard furniture designs were originally produced for Braniff Airlines before being added to the H.M. product line and were in production for less than two years. Of all the Girard furniture designs, the marble tables seem to be the most common (probably the most accessible and best seller of the line). That same base design was used for tables of different heights, a stool, an ottoman, and also side chairs. With a height of only 15.25” I think it is more likely that it was made to go under a stool or a chair than a table. I think the lowest side table was the rare one with the hexagonal aluminum top. Most of the marble topped tables were higher at 20”.
You could always have a piece of marble made and attach it to the table, but in my opinion it won’t be an original Girard table with 50% being a new replacement. The tricky part would be to make a secure connection between the stone and the base. Most have a piece of plywood which has been cemented to the underside of the stone, though I have also seen vintage Girard marble tables which had rubber shock mounts between the top and the base.
You could also make your base into a stool by adding an upholstered seat to the top. I think this would be easier to accomplish than replicating a marble top table, and judging from the height of your base, perhaps more accurate.
In terms of value, I think even a vintage base alone would have value to collectors. Sadly that would have been more the case prior to this year when Herman Miller reissued the Girard marble top table, aluminum top table and “color wheel” ottoman. I’ve seen these re-issues and they are remarkably accurate and well made. They are also surprisingly inexpensive with the hexagonal aluminum table listing for only $799. Once again, something previously difficult to find has become widely available and relatively inexpensive which unfortunately typically drives down interest and prices of vintage examples.
Still nice to know that cool things do sometimes still turn up in thrift stores. Good find, congrats.

Just want to add this link to what was already posted.
http://www.hermanmiller.com/why/an-uncommon-vision.html

Thanks for feedback. I suppose rarity it a relative term; before realize that these had been re-introduced, and with only two years of production , I think "rare" is an accurate description. Nonetheless, for what I paid, I feel like I did pretty well.
As for height, I measure 15 1/4" to the bottom of the base, and I'm seeing ones with the tabletop at 16 3/4", so it seems that witht the block and slab of marble, it cold still be accurate.
If anyone has an up-close pic of how they mount, it would be great. Thanks so much!

I have seen both upholstered and marble square tops assembled rotated 90˚ from being square with legs
I'd make it a stool, I reckon
or just keep it as found with a suitable fabric draped over
can't really lose whatever way