Wavy steps doubled dies

[wavysteps2003]

I sure would like to hear from those out there with strong examples of this particular doubled die. I have a collection of over 150 different dies from the year of 1987 up to and including one very minor die from 2005. I am especially interested in finding dies before 1987 that have wavy steps and ones that show column extension under all columns. Thanks for any help that you can give on this subject.

BJ Neff