This is edition 12 of 150. The letters "WM" contained in the signature cane within the paperweight stand for lampworker William Manson. He worked with Caithness Glass prior to 1978 and then from 1981 to 1997 he worked as a freelance designer but spent much of his time designing and making paperweights at Caithness Glass. The paperweight is etched on the bottom "William Manson SNR 1999 12/150". In excellent condition with no chips, cracks or damage of any kind.
See all photos for a better condition description. Measures about 3.0625" in diameter and 2.5" high.