If the date code and suffix are on the outside of the rim around the valve stem hole it usually works like this:
K-1-Y M <hole> D AZ
where:
K - manufacturer (Kelsey-Hayes)
1 - manufacturing plant (Romulus, MI)
Y - last digit of year
M - one or two digit month (1 thorugh 12) for month of year
D - one or two digit day (1 through 31) of month
AZ - 15X8 wheel used from 1969 through 1982
On the inside as yours is, I believe it works the same but the numbers may be more randomly placed and starting in 1970, I think the year was displayed as two digits to avoid the obvious confusion.
I believe yours is K 1 80 11 26.