yamaha frame numbers

hi new on here ,

so not sure where to post what ,

i have just aquired a yamaha dt 125 lc frame ,

no id ,

all thats on it is a frame number 12w000441

what does this mean ?

the guy who i got it iff said it was a 84 125 lc but can you tell anything buy these numbers ?

if i get parts for it to rebuild would i have to quote these numbers as on parts sites it says the number is not big enough ,

hoping someone could shed some light on this ,

and apologies if this is not in the correct place