Number One in a series of limited edition art prints of legendary vacuum tubes. 
This portrays an original KT88 thermionic valve branded with the British General Electric Co (GEC) label - but most likely manufactored under license by Marconi-Osram Valve corp. 
These are 13" x  19" -  printed on heavy weight 100lb Cougar cover stock. 
Limited to an edition of 25, each signed and numbered.