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The Standard Catalog shows all 24K numbers in 1977, but it isn't correct. A more detailed list I was given several years ago shows the 24K breakdown thus:
24K1 to 24K6700 in 1977
24K6701 to 24K9999 in 1978
Once in a great while, there will be some variances even from this list, but I don't see that very often.
The lists in the SCSW should always be viewed as estimates. In the K series, it becomes much less accurate when you get to the numbers with digits before the K. AND actual ship dates can always vary from what is in the book.