Alt. date code question

[panhead]

Good afternoon folks,

I'm having a hard time comprehending this date code on this alternator.
You can see in the first two pics it has 4 of the spokes with dots in it (Apr 69) casting date. If I'm reading this right
The last pic shows the vendor number, part number, and the assemble date (1-69) Jan. This doesn't add up in my minds eye.
Any help with this would be very helpful.



Thanks Curt

[Alaskan_TA]

Each pie slice is a month.

Each dot is a week in that month.

Your case halves are dated one week apart in April, 1969

Some are months apart.

[panhead]

Each pie slice is a month.

Each dot is a week in that month.

Your case halves are dated one week apart in April, 1969

Some are months apart.

Thank you

That part makes more sense now. 
In the third picture what does the (1 69) represent? 

Curt

[maxwellwedge]

Assembled 1'st week of 1969.....which doesn't make sense. Could there be a faint number beside the 1?

[panhead]

Assembled 1'st week of 1969.....which doesn't make sense. Could there be a faint number beside the 1?

Good afternoon,

There isn't any faint marks that I can see.
Maybe it could of been a 4, or 10,11,12 maybe. Someone must of been sleeping on the job...
So I don't know what the date code for this would be... 

Curt