RCBS seating dies ?

[Digger]

I have two RCBS dies , both are 308 seating dies but one is stamped '12" and the other is "15" ,
What is the difference ?
Have e-mailed an inquiry and also tried the telephone but no responses with ether as they are pretty busy with the bug and business I am sure.
any input would be appreciated , thanks

[Winger Ed.]

They put the date of manufacture on them.

In your case- it probably mean 2012 and 2015.

[Gofaaast]

Ed nailed it! Old boxes from the 70’s maybe early 80’s have the date printed on them backwards as well. If memory serves me correct a few years just had letter codes vs last two of the year.

[Digger]

Thank you much gentlemen !
Always tid bits of valuable info ...