This is without a doubt the most beautiful postcard I have ever seen of spring loaded, anti-backlash spur gears and flowers. I’m guessing it is from the 1940’s?
Book Conservation Services
Book Conservation Services
This is without a doubt the most beautiful postcard I have ever seen of spring loaded, anti-backlash spur gears and flowers. I’m guessing it is from the 1940’s?
Peachey Conservation 
Feels more like a late ’50’s, early 60’s vibe to me.
Whenever it’s from, it is a handsome (and fun) piece of design.
I would guess more like 1960s. PIC’s Catalog #7 was copyrighted in 1955, and it would take a while to get to #21:
http://books.google.com/books?id=QRohAQAAIAAJ&pg=PA1323&lpg=PA1323&dq=PIC+Design+Corp.+history&source=bl&ots=ihdxmdzRpi&sig=ZI3nFMmWK0hbyEuETilVdL8U4ZE&hl=en&ei=sqITTovxHKvQiALSmMzKDQ&sa=X&oi=book_result&ct=result&resnum=6&ved=0CEUQ6AEwBQ#v=onepage&q=PIC%20Design%20Corp.%20history&f=false
On the other hand, Benrus Watch Co. was going through an expansion phase in the early 1950s through the early 1960s, then hit trouble with competition from cheap quartz-movement watches and declared bankruptcy in 1977. So the card is for sure pre-1977, and I would guess that Benrus started shedding non-consumer subsidiaries before that; see
http://thewatchguy.homestead.com/pages/BENRUS.html
http://www.pensandwatches.com/dials/history_of_benrus_watch_company.htm
Thanks to both of you.