Help identifying baseballs
 

I have two baseballs that I have been unable to find anything about, and was hoping someone on here might have some expertise to point me in the right direction.

Based on the Spalding box, I would guess these balls are from the late 50s early 60s.
http://instagram.com/p/rmhmrGF7wB

http://instagram.com/p/rmhiNpl7_6

http://instagram.com/p/rmhfPPl7_2

Not a definitive answer, but in the 1960 and 1963 Spalding catalogs, the Model 171 balls are listed as "Official Home Run League" balls. So I would rule out the years 1960-63.

Those type balls were sold at stores like Mannys Baseball Land in NYC during the early 60's

Thanks for the info everyone.