Boyd Crystal Art Glass marks

The Boyd trademark changes every five years, pieces with a B in a diamond were produced from 1978 to 1983, pieces with a B in a diamond and a line below were produced from 1983 to 1988, pieces with a B in a diamond and a line above and below were produced from 1988 to 1993, pieces with a B in a diamond and a line above, below and on the right side were produced from 1993 to 1998, pieces with a B in a diamond and lines on all four sides were produced from 1998 to 2003, pieces with a B in a diamond and lines on all four sides with a small B in the upper left corner were produced from 2003 to present.

Drawing contributed by Mike Wasser in 2006.