The last 6 digits are usually the unit number (1xxxxx)...so your would of been the 24,569th burb off the Flint production line
so
C= Chevy
K=4x4
E=V8
2=5,200
6=burb
2=1972
F=Flint
124659= vehicle # off the flint line
I use this...probably one of the few things LMC has that I like
http://www.lmctruck.com/icatalog/cb/full.aspx?Page=9