94-96 Convertible Top Glass

[Ed N.]

I'm enclosing a photo of a convertible top glass. Using a C4 94-96 JM decoder, can you determine the date of this glass???



Please let me know.


Ed

Untitled.jpg

[David H.]

Re: 94-96 Convertible Top Glass

Ed

26 April 1996

or: 13 February 1993

Either make sense in your case?

Dave

Sequence is Top Row: Year, Middle Row: Month, Bottom Row: Day

"Add" Dots to determine date.

Dot Sequence is: 1 2 4 8 16

Note: Day of Month line is offset from Year and Month lines by half a step.

[Ed N.]

Re: 94-96 Convertible Top Glass

Ed

26 April 1996

or: 13 February 1993





Either make sense in your case?

Dave

Sequence is Top Row: Year, Middle Row: Month, Bottom Row: Day

"Add" Dots to determine date.

Dot Sequence is: 1 2 4 8 16

Note: Day of Month line is offset from Year and Month lines by half a step.

Dave, when I put the transparency up to the photo I came up with:

20 April, 1995

On the first line it seemed like the 1 & 4 lined up

On the second line it seemed like the 4 lined up

On the third line it seemed like the 16 & 4 lined up, but I could not get the dot all the way left to fall into a circle on the sheet.

I may be doing it wrong though.

Thoughts???

[David H.]

Re: 94-96 Convertible Top Glass

Dave, when I put the transparency up to the photo I came up with:

20 April, 1995

On the first line it seemed like the 1 & 4 lined up

On the second line it seemed like the 4 lined up

On the third line it seemed like the 16 & 4 lined up, but I could not get the dot all the way left to fall into a circle on the sheet.

I may be doing it wrong though.

Thoughts???

Ed

Dot Sequence values are: 1 2 4 8 16

To get a "5" you need 1 and 4 - this means you need a "gap" between those two dots.

Your photo does not show a gap between top line dots or "1" and "2" = 3, or "2" and "4" = 6.

That transparency is problematic to use (at least for me) - much easier to count dots.

Dave

[Ed N.]

Re: 94-96 Convertible Top Glass

Ed

26 April 1996

or: 13 February 1993



Either make sense in your case?

Dave

Sequence is Top Row: Year, Middle Row: Month, Bottom Row: Day

"Add" Dots to determine date.

Dot Sequence is: 1 2 4 8 16

Note: Day of Month line is offset from Year and Month lines by half a step.

Dave, did from my phone and reduced the size of the photo/dots into the circles and came up with 2/13/93.

[Ken R.]

Re: 94-96 Convertible Top Glass

explain the dot for dating please?

[David H.]

Re: 94-96 Convertible Top Glass

explain the dot for dating please?

Ken

AP Tech, C5 and some C4 glass used "Dots" aligned in a matrix to record production date.

Top row of dots indicated YEAR

Second row of dots indicates MONTH

Third (bottom) row of dots indicates DAY of Month

Some glass, like the convertible rear window above, has all three rows: Year, Month, Day.

Front/side windows may only have TWO ROWS, indicating Year and Month.

Complete dot sequence values are: 1 2 4 8 16 - Maximum count if all dots are visible is 31 (1+2+4+8+16), so Day of Month is covered.

Year and Month (max 12) are covered by: 1 2 4 8 - "4" and "8" covering December

Note that max number of dots for month and year identification is four - (Day of month row has five positions)

Day of month row is offset forward half a step from year and month rows.

A gap between dots means don't count that number.

Difficulty comes with where do you start counting. An odd numbered year will have a "1" dot, an even numbered year won't.

So is the first dot you see a "1", or a "2", or a "4"? Often dots on other rows give you an indication of where you should start counting.

Once you use dot counts a few times it becomes much easier. And MUCH easier than the alphabet soup that LOF date codes are.

Dave

Trust you both are Covid free.

[Ed N.]

Re: 94-96 Convertible Top Glass

Ken

AP Tech, C5 and some C4 glass used "Dots" aligned in a matrix to record production date.

Top row of dots indicated YEAR

Second row of dots indicates MONTH

Third (bottom) row of dots indicates DAY of Month

Some glass, like the convertible rear window above, has all three rows: Year, Month, Day.

Front/side windows may only have TWO ROWS, indicating Year and Month.

Complete dot sequence values are: 1 2 4 8 16 - Maximum count if all dots are visible is 31 (1+2+4+8+16), so Day of Month is covered.

Year and Month (max 12) are covered by: 1 2 4 8 - "4" and "8" covering December

Note that max number of dots for month and year identification is four - (Day of month row has five positions)

Day of month row is offset forward half a step from year and month rows.

A gap between dots means don't count that number.

Difficulty comes with where do you start counting. An odd numbered year will have a "1" dot, an even numbered year won't.

So is the first dot you see a "1", or a "2", or a "4"? Often dots on other rows give you an indication of where you should start counting.

Once you use dot counts a few times it becomes much easier. And MUCH easier than the alphabet soup that LOF date codes are.

Dave

Trust you both are Covid free.

Dam, now I'm really confused (lol).

[Pat F.]

Re: 94-96 Convertible Top Glass

Ed, it is all under control per our conversation. The answer is April 26th, 1996.

[Ken R.]

Re: 94-96 Convertible Top Glass

I need to go back to high school math for this! But thanks for the lesson. We both are ok; Vicki had a bad lower back in Mobile, so stayed in the hotel room, and I just stayed away from crowds.

[Ken R.]

Re: 94-96 Convertible Top Glass

So here is my 2021 front windshield: are the dots shown representative of the date?
2021-07-03 11.23.19.jpg

[David H.]

Re: 94-96 Convertible Top Glass

So here is my 2021 front windshield: are the dots shown representative of the date?
[ATTACH=CONFIG]112498[/ATTACH]

Ken

Of course not!!!

C5 / C6 use different date coding methods. Pete Bergman is putting together our new C6 TIMJG and these glass codes are an on going issue.

Pete has examined numerous C6 checking build date vs dot codes trying to find a decode that makes sense.

Overall general scheme seems to be "******YY******" Where YY is year and dots "*" before or after YY indicate month.

No scheme seems to work all the time vs car's build date.

I would interpret **21 as May 2021 - could as easily be Feb 2021.

If you've got a scheme let Pete know!

Dave

[Ken R.]

Re: 94-96 Convertible Top Glass

I figured it was 3/28/2021. But who really knows. Will see what my 07 and 09 tops were. Here are the 2003 side window and front w/s showing the dots. Interesting.
O3 made August of 2002.
sidewindowlogo.jpgWindshieldlogo.jpg

[David H.]

Re: 94-96 Convertible Top Glass

Ken

Your two Row and three row C5 date codes.

Dave

3 Row Date.jpg2 row date.jpg