I haven't had many 20" diameter Tiffany Studios Nasturtium table lamps for sale. This example is a beauty, with red and yellow flowers that are textured on the interior, making them very lively. The big oval leaves are varied, with different shades, and different types of glass, including mottled, striated, and streaked. The sky has some very nice blue mottling. 

The library base has an outstanding, rich, original patina, making the complete lamp a very desirable unit.

24½" tall x 20" diameter. Signed shade and base. Excellent condition, with very few hairline cracks.