any info on this Rare nelson cabinet  

Why?
Are you asking for your own edification or so you can get more money for it when you sell it on eBay?
I know a bit about it, but it sounds like you already know what you need to. It's a Nelson design and it is a cabinet.

Not selling on ebay
I am not selling this on eBay. I am looking for more info for myself. I have several HM catalogs, and this series does not appear in any of them. I would love to see what else was made in this series. I have seen night stands and dressers but nothing like this. Thanks

I cant help you
But I wanted to say that it is very nice!

Dear Pegboard
I have never seen this one either. Can you enlighten us? Was it in one of the catalogs? Don't be shy! 🙂

All original
This cabinet is not missing any components. It is all original. Thanks for you comments.

Could this be one of the
custom made cabinets for a specific installation?
I believe that when an installation was comissioned back then, some customization could be ordered. The piece looks like a standard thin edge(?) carcass with some modications, apparently for that specific purchase.
I've never seen it numbered and available for standard sale, though.

There is a number stamped on the bottom
There is a number stamped on the bottom next to a penciled initial, but you can not read it. The number is 5231.

The "Thin edge" pieces
in the 1956 catalog are numbered 5200, 5201, 5202, 5221, 5361, 5240, 5245, and 5432, so probably the 5300 series were modified custom pieces, or possibily some prototype or very short-lived series.
Either way, when a piece was made, it was given a number, whether or not it went into major production or not.
It would be nifty if there was a resource of all known HM numbers and what they were, etc.

More
Sorry if my initial reply sounded harsh, but I get tired of sharing information that I have acquired from years of collecting, dealing and researching just to see that info used to maximize profits when forum members sell the item they are asking about. I have no problem sharing what I know with folks who are also participating in the forum and sharing their knowledge.
Your piece is simply an early version of the thin-edge group which was designed in 1952. They came with that kind of leg design as well as a white wire pull. I have only ever seen it in the combed oak which might also sometimes be ebonized black. I've never seen those wire feet/ pulls on rosewood thin-edge. The most uncommon things about this version is the finish and the wire feet and pulls. I have seen thin-edge with the conventional pulls and feet in the combed oak, but that is uncommon as well. While the thin-edge group could be also ordered in teak or walnut, mostly what you see is the rosewood. The cabinets/ dressers/ night-stands etc. of this early version were of the same design or configuration as the rosewood group. I've never seen a unique case good design in this early version.
While the thin-edge group was designed in 1952, it did not appear in that year's catalogue. The rosewood group is in the 1955 catalogue. So to my knowledge, unless there was some sort of brochure or catalogue supplement, this version was not shown in a Herman Miller catalogue. It is my understanding that it was offered for less than one year. I suspect that they decided to focus on rosewood as the signature style of the thin-edge group since it was to be the high-end line of case goods. The basic cabinet group was the middle price-point, and the steel-frame group the least expensive. In fact in the 1955 catalogue they call the entire thin-edge line the "Rosewood Group".
I have seen thin-edge rosewood bookcases which have the interior painted white, so I do believe this one is likely all original. I don't know why they painted the interior like that, and whether that is an attractive design choice is something that could be debated I guess.
While it was in production for a shorter time, I have seen a fair number of these pieces. The thin-edge group was always expensive, and people who bought them were fewer, and they tended to take care of their things. We have had, and currently own some of this early thin-edge. We got a couple pieces a while back and decided to keep the two-drawer cabinet and sell the dresser. These early versions sometimes appear at auction (Wright has a night-stand in their upcoming auction I believe) but they rarely bring more than regular rosewood thin-edge case goods.

I think, Pegboard,
that's it always OK to part with information here, since 99% of the people here are located so far away from you or I that none of us would ever be considered "competition".
If, though, I find a cool clock on eBay, I might not advertise it until I either win it or the prices gets so high that I'm no longer in the running.
In general, I'll share info anytime...it's always right for me to do.

Sharing is indeed caring.
Sharing is indeed caring.

Here is the nightstand
From the Wright auction yesterday.
http://www.wright20.com/auctions/view_search/HOLT/HOLU/397/LA/nelson_nig...

Thanks, Pegboard!
I have learned something new today. Thanks.

THANKS
Thanks pegboard for the info. I am a huge nelson fan and plan on keeping this cabinet for a very long time. I wonder if the cabinet was some type of special order or made for an exhibition of some type? Thanks again