Rear glass date code (71) - 1 month newer?

[Michael F.]

Hi All,

Is it possible to have a rear window date code that is one month newer that the build date? Now, my 71 was built on 4/29 (a Thursday), so it was real close to May. And the rear window has the JN code on it. I'm wondering how strict LOF was on codes or if they wavered a bit.

Thanks!

[Warren F.]

Re: Rear glass date code (71) - 1 month newer?

I have a '71 with a trim tag code of I 20 for April 20th, 1971, the rear window has a code of NN which is January 1971.

[Mark H.]

Re: Rear glass date code (71) - 1 month newer?

My '71 is an F09 (Jan 9) and the rear window is an AT (Sep 70).

[Michael F.]

Re: Rear glass date code (71) - 1 month newer?

I guess I wasn't clear. My build date is 4/29 and the glass date is JN (May 71), which is after the build date. I'm wondered if that's even possible.

[Terry M.]

Re: Rear glass date code (71) - 1 month newer?

I guess I wasn't clear. My build date is 4/29 and the glass date is JN (May 71), which is after the build date. I'm wondered if that's even possible.

With the removable rear window that is easy. AeeUming your date de-coding is correct (I didn't look it up myself) -- Something happens to the original window, perhaps even before the first owner takes possession, and the dealer sources the rear window from another Corvette in his inventory. I can think of numerous other scenarios that would cause a date newer than the car to be installed, but none of them involve St. Louis. That why our judging standard is TFP (Typical Factory Production).

[Edward J.]

Re: Rear glass date code (71) - 1 month newer?

Mike I think in a situation like your yours it would be hard to prove as with most glass dates I have seen the glass is generally at least 4 to 8 weeks before the build dates. and the NCRS gives you one year on glass but not after the build date. Some one like Terry M. may surely know as he has seen more C3 than any one here.

[Michael F.]

Re: Rear glass date code (71) - 1 month newer?

With the removable rear window that is easy. AeeUming your date de-coding is correct (I didn't look it up myself) -- Something happens to the original window, perhaps even before the first owner takes possession, and the dealer sources the rear window from another Corvette in his inventory. I can think of numerous other scenarios that would cause a date newer than the car to be installed, but none of them involve St. Louis. That why our judging standard is TFP (Typical Factory Production).

From a judging stand point then, this would be a deduction? Sorry, I don't have the judging guide.

[Terry M.]

Re: Rear glass date code (71) - 1 month newer?

From a judging stand point then, this would be a deduction? Sorry, I don't have the judging guide.

If you have de-coded the marks correctly = yes a judging deduct. Date = 20% of originality points. I mention proper de-coding since the date codes are not always clear, and they can be read improperly if you read them backwards.

Judging sheets are on this site https://www.ncrs.org/membership/scoresheets.html or click on "member services" radio button at the top of the page. The bottom item on the drop down menu is the link I posted. Window glass is on the exterior sheets. Rear glass for 1868-72 is a single line item = 8 originality points. 20% of 8 = 1.6 points. No fractional deductions are allowed. Some judges would round up to 2 points, but some might not. There is a method for dealing with fractional points, but explaining it would take more keyboarding than I want to do right now. Join a chapter, or come to a Regional or National meet for one of my Advanced Judging Seminars. A day of classes will start you out with the judging rules and techniques. Even if you have no intention of being a judge, an educated owner is going to make better choices when working on their car.

[Dennis C.]

Re: Rear glass date code (71) - 1 month newer?

From a judging stand point then, this would be a deduction? Sorry, I don't have the judging guide.

Mike,

i believe glass is subject to a standard deduction. I don't have the standard deduct table with me, but besides being in the book I think it has been posted here before.

Regards,

Dennis

[Terry M.]

Re: Rear glass date code (71) - 1 month newer?

Mike,

i believe glass is subject to a standard deduction. I don't have the standard deduct table with me, but besides being in the book I think it has been posted here before.

Regards,

Dennis

Excellent catch Dennis. I completely forgot about that. You are right.

When do we not use CDCIF? When the Standard Deductiona apply.

I will have to take some remedial classes, and stay after school for training.

[Dennis C.]

Re: Rear glass date code (71) - 1 month newer?

Terry,

I actually replied before reading your response. I need to be more careful in the future.

I haven't had the opportunity to check the standard deduct, but I suspect you gave the correct answer of 20% anyway.

Regards,

Dennis

[Terry M.]

Re: Rear glass date code (71) - 1 month newer?

Terry,

I actually replied before reading your response. I need to be more careful in the future.

I haven't had the opportunity to check the standard deduct, but I suspect you gave the correct answer of 20% anyway.

Regards,

Dennis

Right you are again, Dennis. This time I looked it up. 20% deduct for date in the Standard Deductions.

[Reba W.]

Re: Rear glass date code (71) - 1 month newer?

Right you are again, Dennis. This time I looked it up. 20% deduct for date in the Standard Deductions.

20% IF everything else is correct.