Batting Helmet Dates?

[shoremen44]

Guys... I need some help here...

I just got a bunch of batting helmets and I am trying to figure the dates they were manufactured.

They are all ABC helmets with the circular stamp on the inside...

How do I know when each was manufactured, does the inside stamp correlate to a manufacturing year?


thanks

[flaco1801]

i think decoding the abc helmet time stamp is the next indiana jones movie.....