From 1950, I believe this is the fourth edition, but I could be wrong. There were a total of 3500 copies of this printed up. This catalog is in good condition on the inside, but as you can see, the outside isn't the best. It is 57 years old, though! $9 plus shipping in a padded envelope at book rate, not more than $7. Insulator Trades accpeted. Shipping can be combined, and other methods of shipping are optional. Let me know.