Is this Jean Prouvé  

Uhhhh
....

Prouvé, no . . .
wonderful, yes. I'd keep it, and spend the rest of my time finding the source.

A lot of galleries and...
A lot of galleries and auctionhouses sell this desk as a Prouvé, but now and than you see it sold as 'in the manner of' or 'after'. So is this tubular desk an authentic Prouvé desk or would he never have designed like this? Did he only do folded style furniture?

It would sadden
me to learn that sellers are suppressing the true origin of this design, in order to trade on the idea that it's Prouvé. I'm not a Prouvé expert -- but I've not seen him use tubing in this (relatively crude) way. The resulting form doesn't have his touch, in terms of elegant detail and well-considered proportion -- in my opinion.
I see no reason why, for instance, the bottom U of the frame shouldn't have been made in one (bent) piece. . .
The desk portion seems adjustable up and down. If so, why isn't there a similar locking knob on the seat post ?
Prouve's sheet metal pieces often seem to have been borrowed from aircraft practice. The same can't be said for the brackets supporting this desk top.

It is Prouve Mobilor
It is Prouve Mobilor

The reason the tubes are not...
The reason the tubes are not curved at the bottom of the "U" is that it is a child's desk and both seat and desk need to be height adjustable. Edited to clarify: The desk with the straight tubes allows at least an extra 150mm of height adjustment; not elegant, but practical and functional when considering the original purpose of the design.

this is better
SDR,
This photo appears to show what you stated. The attached article has a catalog page calling this is the "Pupitre une Place" Variante 2 1936
http://lepontdeslions2.canalblog.com/

Thanks. I haven't
translated the text -- I'll take it on faith that the blue-green desk is in fact Prouvé. Then, note that the clunkier desk shares only its round seat and rubber feet with the later version, piece for piece. I'm still unsure of its origin -- but the case for Prouvé is improving . . .

unconvinced
SDR,
The second desk is executed far better with or without the Jean Prouvé attribution, I just want to have fun with:
It is Prouve Mobilor posted by kunstbu
The reason the tubes are not curved at the bottom of the "U"... posted by mafbail
I have located the designer and date of kunstbus' desk. Jerome Lester Horwitz, Curly Howard, in the late 1930's.

🙂 Nice Guy
A High End...
🙂 Nice Guy
A High End French auctionhouse has acknowledged my desk as JP Mobilor and they do sell the curved one. They do not want to sell my version because it's just not a popular one. It is nowadays commonly used as an item to put your tv-set on. By mistake perhaps? you see my version go for 1000+ or even 2000+ pecunia's but usely it is a few hundred. And i must say, i only bought it because of the attribution, i didn't even look at it. But i am pleased with it now and i am thinking of putting my old tv in the bedroom on it 🙂

not Jean Prouvé but Jacques Hitier
I always thought that these school desks were not refined enough to be by Jean Prouvé so I did some research.
So the curved version appears to be produced by Mullca, a French company which is more famous for it's La Mullca school chairs. Model 300 was designed by Jacques Hitier who also designed a similar chair for Mobilor. (source: http://fr.wikipedia.org/wiki/Mullca)
There is a book called 'Jacques Hitier, Modernité industrielle' by Pierre Gencey which shows the angled version of the school desk.
http://piqpoq.bigcartel.com/product/jacques-hitier-modernite-industrielle

You have made my day, Thank...
You have made my day, Thank you very much. And i would be very grateful if you could post a picture wherein i can read the tekst.

I do not own the book, I just found the picture on the good old interweb. And even on the high res picture the main text is unreadable.
The title seems to be 'table S. 43. réglable'.

wow
that was nicely done.