Need some glass date codes! - ZR-1 Net Registry Forums

WVZR-1 · 02-27-2013

It seems that something around '93 or '94 LOF/Pilkington maybe changed their "date coding method". I've a format that I've used since the late 50's and it's been consistent through for sure '93. It's for sure not consistent with '95 & '96 C4 builds.

The date code will be two letters on the windshield 2nd row from bottom separated generally by 3/4". On the door glass they're side by side. I'd like to change the format I use to be correct.

It would be good if I had just the car#, production date from drivers door and the codes from the glass. It would be good to have maybe 5 or 6 each '93, '94 and '95 builds.

I'll post the corrected "format" when done. I can assure you the Internet sources out there aren't correct for anything it seems newer than '92. Pilkington dealers don't know.

***It would NOT be unusual for a '93 build to have a '91 date coded glass it seems. A few years ago Ryan mentioned I believe his '93 #248 had a GJ windshield. It was never mentioned that it had been replaced.

WVZR-1 · 02-28-2013

I believe I've got correct codes now for years '94 and '95 that don't follow the several decade old sequence but I'm quite confident they're correct. I'll just do the C4 years that involved ZR-1 production 1989 through 1995.

The months seem to be consistent:

N/January,X/February,L/March,G/April,J/May,I/June,U/July,T/August,A/September,Y/October,C/November,V/December

The years:

C/1989, G/1990, J/1991, A/1992, Z/1993, X/1994, Y/1995

The years through 1993 follow an LOF format that was used from early in the 1950's - the years 1994 through end of C4 production don't follow that format. Why? Don't know. 1996 production would be a U and I mention that only because it closes the C4 production. I expect it has something to do with a 1994 settlement between the US Justice Dept and Pilkington who controlled the LOF branding and float glass technology used at the time.

'93, '94 & '95 owners if you'd like to check and confirm - please do! The codes are for the production month/year of the glass NOT the MY of the car!

02-27-2013	#1
WVZR-1 Join Date: Oct 2004 Posts: 1,890	Need some glass date codes! It seems that something around '93 or '94 LOF/Pilkington maybe changed their "date coding method". I've a format that I've used since the late 50's and it's been consistent through for sure '93. It's for sure not consistent with '95 & '96 C4 builds. The date code will be two letters on the windshield 2nd row from bottom separated generally by 3/4". On the door glass they're side by side. I'd like to change the format I use to be correct. It would be good if I had just the car#, production date from drivers door and the codes from the glass. It would be good to have maybe 5 or 6 each '93, '94 and '95 builds. I'll post the corrected "format" when done. I can assure you the Internet sources out there aren't correct for anything it seems newer than '92. Pilkington dealers don't know. **It would NOT be unusual for a '93 build to have a '91 date coded glass it seems. A few years ago Ryan mentioned I believe his '93 #248 had a GJ windshield. It was never mentioned that it had been replaced. Last edited by WVZR-1; 02-27-2013 at 06:56 PM.*

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02-28-2013	#2
WVZR-1 Join Date: Oct 2004 Posts: 1,890	Re: Need some glass date codes! I believe I've got correct codes now for years '94 and '95 that don't follow the several decade old sequence but I'm quite confident they're correct. I'll just do the C4 years that involved ZR-1 production 1989 through 1995. The months seem to be consistent: N/January,X/February,L/March,G/April,J/May,I/June,U/July,T/August,A/September,Y/October,C/November,V/December The years: C/1989, G/1990, J/1991, A/1992, Z/1993, X/1994, Y/1995 The years through 1993 follow an LOF format that was used from early in the 1950's - the years 1994 through end of C4 production don't follow that format. Why? Don't know. 1996 production would be a U and I mention that only because it closes the C4 production. I expect it has something to do with a 1994 settlement between the US Justice Dept and Pilkington who controlled the LOF branding and float glass technology used at the time. '93, '94 & '95 owners if you'd like to check and confirm - please do! The codes are for the production month/year of the glass NOT the MY of the car! Last edited by WVZR-1; 09-24-2015 at 05:34 PM.