While reorganizing some of our insulators we found this box. Several interesting things to note:

1) the old 508 MA area code on the box

2) there is no email address or web site address

3) Patent Dec 19, 1871 insulators are refered to as "DEC PAT" a name only used in the 1991 price guide

4) it is in black and white

#1 dates it before about 1997

#2 dates it around 1993

#3 dates it after 1990 but before 1995

#4 dates it after 1993 when we got our first computer and printer but I do not know when we got our first color ink jet printer