Who made this pottery Light shade?

I know we have these lampshades on the site ..... somewhere!  
Arghhh I can't find them.
This one is going in my kitchen and will look great with all of my studio pottery and stuff.
Now how interesting to find that this is really very light for it's size and the clay colour is a dark terracotta.
I remember these from the 1970's when they were very popular, but I don't know who made them.

Orzel me thinks Ev but they got Royal Oak froth..

It doesn't feel like Orzel Kat and the clay is a very dark brown and they would have slipcast the shade with this dark clay.  I don't know of anyone who used this clay?
Can you think of some likely suspects?  I don't think Royal Oak used this clay but would love to be corrected.  The clay colour doesn't really show in the photo.
I would love to find the other ones on the site to see if they used this dark clay too.

Edits to add the other ones that have been posted thanks to the help of Google...

http://www.newzealandpottery.net/t6107-orzel-lightshade

http://www.newzealandpottery.net/t6253-is-this-lampshade-royal-oak-and-ro-jar-for-gallery#30293

Hi, Lets look at this lamp base can you tell me if it is raw biscq inside or a clear glaze? underneath has it been nicely finished fettled and sponged or a bit ruff?
could it be a hobbie ceramic piece ? or it may be a Clay Craft It's not a Terra Ceramic piece.

Hi signal-red thank you for stopping by
Here is a photo of the base and the clay is dark brown ...



It has been fired upside down on this bare clay top end.
The inside is a white tin glaze and it covers the dark brown clay very well.
The outside has contrasting glazes that break beautifully.
It has a totally professional finish and I remember these in the shops in the 1970's.
These have been slipcast using a low temperature brown clay by someone who knew what they were doing and they must have made heaps.
Thank you for letting us know that Terra Ceramics were not making these.

A listing for these shades on Trade Me alerted me to the name Cloverley Lamps.

http://www.trademe.co.nz/a.aspx?id=1253178683

Google told me that the company was incorporated in 1954 and dissolved in 2000.
Alison and Roger Crawshaw were running the company in Epsom.

Further investigation turned up that 24 Veronica St, New Lynn was where it was located and other names that this company went by ...
Dynamic Displays Ltd
Porcelain Promotions Lts
Kermiko Potteries Ltd
and the Directors were Barry and Joy Sluiters.

I think they will know who made these.  In fact they may have made them themselves !!

Exciting. I have asked a question about this on the listing. Well spotted Ev.

For the record, here is my question and the seller's response... still more work to do!
HI I (and other researchers) have been searching for a maker for these lamps for some time. Can you tell me any more about how you found the maker's name. This is very exciting information. Val Monk.
Hi Val , I came across a reference by goolge - which I can't find now ! . But The posting attributed these shades to Coverley Lamps Ltd 1954 - struck off in 2016 , Alison & Roger Crawshaw directors , registered 18b Aberfoyle st Auckland . There are no stickers or marks , so it is only a possible maker !