Number stenciled on air cleaner

[sbgarage]

Howdy all, hope everyone is enjoying summertime and is ready for Independence Day.

My recently acquired m1009 has 1-08 stenciled on air cleaner and rear inner fender wells. I have not seen the number anywhere else, but havent done too much more looking or work to it aside from pressure washing it as I have been too busy with work.

Does anyone know why or what it means?

Thanks!

 

[sbgarage]

 

[Black Ops]

It might be the date it was serviced. My blazer has a date in the wheel wells and “WB”, probably for wheel bearings.