Where's the lens Item Number?

[Mikep996]

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There are references in the lens detection list to Leica item numbers.  I have seen posts that say "item numbers" are on the lens barrel opposite the infinity index but none of my Leica lenses have numbers on the barrel anywhere that I can see.    I recall that back when I had Leica gear previously, at least one of my lenses (maybe all?) had an engraved number filled with white paint on the barrel which I now assume was an "Item Number."  SO...where is the "Item Number" on, for example, a late 90's 50 Summicron and a late 90's 90 El M?

Edited June 10, 2020 by Mikep996

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[a.noctilux]

On the box or on the receipt ?

or Wiki ?

for example Summicron-M 50mm

Edited June 10, 2020 by a.noctilux

[Mikep996]

AH! that Wiki link is just what I needed!  I did a search on line using "Leica Item numbers" but that link didn't show up.  Thanks for posting it!