69 camaro rear end numbers

[70 ls6 convert]

my friend is looking at buying a 69 rs ss ,,he got these numbers of the axle tube,b11123g1 any help would be awsome kris....

[enio45]

Try this web site to help....
http://www.chevy-camaro.com/parts/chevy-camaro-part-codes-axle.htm

looks like a 2;73 rear, non posi - date stamped 11/23 (nov 23rd)

what is the built date of the car and other numbers?