Broadcast Sheet / Fender Tag Engine Codes

H6B H6 = Bucket seats, vinyl, B = Blue
The 830 is likely the scheduled production date August 30th 1968 for the 69 Model Year.

In general, the new model year production date started on Aug 1st.
They are coded 1-9 or A,B,C. followed by the day of that month.
1 = January
2 = February
3 = March
4 = April
5 = May
6 = June
7 = July
8 = August
9 = September
A = October
B = November
C = December