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Based on GM data. Some options get broken down, but some times they don't.
L34 - sorry, got tired of crunching the numbers.

How well do these number reflect to the data you have accumulated to date?

So many 69 cars that one might assume the data presented would be higher.

Here is the VIN of the protect-o-plate I have in my possession :
124379N547204

It is the pamphlet card with the plate attached and the original purchaser's name and address present.
Dealer sale was OHIO.

(Quadrajet Date Code) : 0429 (February 11) manufacture (assembly) date for an 04C vehicle (3rd week of April)...

Informative read!!!
Was looking for something like this.

Kurt and/or Mark ,
Was searching for a thread discussing how the date codes should be understood.
Julian dating for a Quadrajet, the numerical sequence :
Is the date starting on January 1'st, of each year for Quadrajet builds?
In looking at a date, did GM count every day of the week in towards their numerical stamping on each Quadrajet body?
What I was thinking is that every Saturday & Sunday counted in the numerical order when being designated with a build date.
Is this a valid statement?

So, let's say, a 7029202 as above, the 0429 date...
Should we all count Every Saturday & Sunday towards the numerical order increasing in order to determine the actual day of the build of a  Quadrajet ?

Kurt S
Do you have anything regarding this VIN ?
124379L517385

[1]

One pic shows the 13 date and the other, if you look close enough, the top of the font of the numerical 1 is present.

Cleaning these up properly, at times we can see the toolong that the letters and numbers were struck with.

The Y and J show that circle around the letters

[B]

OK, so I found another 14x7 YJ rim.
Stamping is 14X7 JJ   10 B
The rim is a K-1-9  10-13 dated rim.
Now we have A & B  present on the bands.
So, I am continue to look into these; dates or letters exist!

Here is the letter B stamping with the 10 for the month

sometimes as i continue to look at these, the 10-8 code : that 8 sometimes, to me, appears like a letter B

Thoughts?

another from the 68/69 set...

On this rim shown, the center is K-1-8 and the band is K-1-9

All dated first week 1969 at the valve stem.

Ill have to check if all have the 14X7 JJ with the A stamp and no month/day codes

I have a set that are last week 1968 and 1st week 1969 dated.

Some have K-1-8 and some have K-1-9; days apart.

more pics...

Another pic :

Well, I had some of my extra YJ rims chem stripped and this process really cleans up the visibilty of the the codes on the rim bands.
However, month and date codes are not consistent as it seems when they were at KH being date stamped.
Letters and numbers can be found, and can be random.
I think either is correct.
Checking date codes at the valve stems, codes in the center of the rim, to codes in the band will help somewhat in ID'ing these.
Here are a few pics from a set I am selling :

Anything relative of the smooth vs pebble grain wheel in 69 across models, and/or build timelines?

Any supply issues at the plants for this wheel while being assembled?

That's a close assembly timeline to your build date of your rims.
I would think that VN & Norwood were moving rather quickly by this time of the year.

My guess is is that both plants saw a drop off on manufacturing during the holidays.
They were still producing but at a slower pace.

Once everyone was back to work, I would assume that production times and dates came back together.
Alot like where your rims are so much closer to your build dates.

Maybe this s a good time to begin a K-H rim submission.

Maybe we could start a thread per coding:
YH rim thread
YJ rim thread
XT rim thread

Maybe a month by month categorizing.

If you are able to get the wheel center and band codes, that would be great!