Can't find much information on Kupur.
The best I have come up with is Kupur is a Russian/Hungarian artist. He was active from the early 20th century into the 50's and possibly the 60's.
I have seen sculptures and watercolors from him, but not much.
1stopretroshop had one lamp like this for $42.00.
goantiques had a pair of 1930's Kupur lamps listed for $110.00.
These are some results from liveauctioneers.com:
 Modern Sculpture Kupur, Jonah Whale Clars Auction Gallery Sold For $60 30th Jun 07 Lot #4154 |  Pair Signed Kupur Art Deco Figural Bookends Point Pleasant Galleries Sold For $325 2nd Dec 07 Lot #547 |  Signed Kupur, Russian School, gouache, "At the River" Bill Hood & Sons Arts & Antiques Auctions Sold For $100 13th Nov 07 Lot #1282 |
 Pair Art Deco Silvered Lamps By Kupur Millea Bros Ltd 21st Nov 09 Lot #211 |  2 Kupur Art Deco Figural Busts Man & Woman Uniques & Antiques, Inc. Sold For $160 12th Sep 06 Lot #33 |  Art Deco Silver Gilt Copper Statue Clars Auction Gallery Sold For $350 14th Sep 08 Lot #6407 |
 Kupur (Twentieth-Century) Rural Landscapes SUSANIN'S Auctions Sold For $100 10th Feb 07 Lot #6303 |
