old oregon guide bar markings

[doubleAgrader]

I've got a crapload of old oregon bars, all commercial long ones , the markings on them are fairly universal with a few exceptions but I know somebody must know how to decipher them , the suffixs are what is different and up to now , unknown for me, an example like"338XXXD009 TC, or 378XXXD009 UH, others are "SMA" "SYA", I just wondered if it is something like rail material or something as simple as profile or chain ID, thnkx

 

[psuiewalsh]

New Oregon bars D009 is large Husqvarna. Usually the front numbers are length and pitch. There is a chart on Oregon's website for newer bars. Someone with an old catalog stashed away may be able to answer old designations.

 

[psuiewalsh]