1970 Picket slide rule in case vintage

This was my husbands when he was going to be a draftsman in the 70’s.
This is in really good shape for being about 50 years old, would make a wonderful gift for someone.
No need for it now so we are hoping it has a bit of value
To help raise money for our kids and for the community garden next year.

It’s a Pickett No. 120 made in the USA.