1969 MLBPA baseball pins

[teetwoohsix]

I picked up about 9 of these today at a local antique mall,and I know nothing about them.If anyone could give me information about them,I sure would appreciate it-such as,who distributed them?Are they rare,or pretty common?Any idea on what they are worth?Here is a list of the ones I got-

1)Sandy Koufax Los Angeles Dodgers (red & white)

2)Tony Oliva Minnesota Twins (blue & white)

3)Eddie Mathews Milwaukee Braves (red & white)-2 of these

4)Bob Allison Minnesota Twins (blue & white)

5)Duke Snider Brooklyn Dodgers (red & white)

6)Willie McCovey San Francisco Giants(red & white)

7)Norm Cash Detroit Tigers (blue & white)

8)Stan Musial St.Louis Cardinals (red & white)

The Sandy Koufax & the Willie McCovey are slightly larger than the rest,and around the edges of all the pins,it says--1969 MLBPA Mfg in USA

I would appreciate any info/history anyone could share with me on these.
Thank you,
Sincerely,Clayton