Canon lens year of manufacture finding from its serial no

I am planning to buy used canon 100-400 Ver1 lens. However seller has told me that he has not retained bill or receipt.
Some time back i have seen a message in this forum that year of manufacture is coded in serial number of the lens.
Can some one share that plse
Regards Sudeep Manak

https://www.the-digital-picture.com …ses/Canon-Lens-Aging.aspx

05Xrunner wrote in post #18466590
https://www.the-digital-picture.com …ses/Canon-Lens-Aging.aspx

That chart shows info starting with 2008 and that lens (version I) could possibly date back to 1998, its year of introduction.

John from PA wrote in post #18466753
That chart shows info starting with 2008 and that lens (version I) could possibly date back to 1998, its year of introduction.

Take another look. It goes back to 1960.

Bassat wrote in post #18466765
Take another look. It goes back to 1960.

Sorry, yes it does, just scroll down.

Thanks everyone

These are the nos on my lenses.
50mm f1.4.. 17983015
24-105 f4.. 4667930 and UA0925
70-300 f4..5.6... 91806274

Excepting UA0925, other two lenses have 8 digit nos and not 10 digit nos as said in link in post no 2 above

Have i missed any thing...

only L lenses you can look up. non L lenses you cant use the codes to find anything

05Xrunner wrote in post #18467290
only L lenses you can look up. non L lenses you cant use the codes to find anything

Then why, in the article, do they use the EF-S 18-200 lens as an example?

In the 10 digit numbers, I do understand the DD C SSSSSSS as explained.

What I don't understand is finding the year with the letters A thru Z. where is that found in the 10 digit code?

And then the letters A thru G all have 3 separate years that each of those letters might represent, with the rest of the alphabet having 2 possible years. How do you know which year the letter (for example) A equals? Is it 2012, 1986 or 1960?

What happens beginning in 2019 and after?

My 70-300 lens (non L) I bought new in 2008. The S/N on this lens is 45608200

It looks to me like there is no way to date my lens with the 8 digit number.

05Xrunner wrote in post #18467290
only L lenses you can look up. non L lenses you cant use the codes to find anything

The TS-E45, TS-E90 and MP-E65 also use the same date code system as L lenses.

Inspeqtor wrote in post #18467313
And then the letters A thru G all have 3 separate years that each of those letters might represent, with the rest of the alphabet having 2 possible years. How do you know which year the letter (for example) A equals? Is it 2012, 1986 or 1960?

There's little or no likelyhood of any lenses being in production long enough to have the same date code as an earlier example.