M frame lense marking

[rik78]

Looking at M frame lenses I have notice that some lenses do have the "oakley" at the bridge an some other don't.

Why is that? Is this due to generations, colour ways, replacement lens....
There is any way to know if the lenses that dont have it are autentic?

some pics to ilustrate what I talking about, all then pics are from this holy forum, some pics are the marking some without...

in this one, two on the left without, two on the right with

 

[MicahS]

Gen 1 lenses typically don't have any bridge etching.

 

[TNGoldbeard]

Looking at M frame lenses I have notice that some lenses do have the "oakley" at the bridge an some other don't.

Why is that? Is this due to generations, colour ways, replacement lens....
There is any way to know if the lenses that dont have it are autentic?

some pics to ilustrate what I talking about, all then pics are from this holy forum, some pics are the marking some without...

View attachment 982171View attachment 982172
View attachment 982173
View attachment 982174
View attachment 982179
View attachment 982175
View attachment 982176

in this one, two on the left without, two on the right with

View attachment 982177

Is that an electric mustard M?

 

[PiesangKop_ZA]

As Micah mention, the first gen don't have the 'Oakley' bridge etchings.

Unfortunately aftermarket lenses won't have etchings either. These can however usually be told apart from the real deal due to differences in the tint and base lens colour, polarisation (most cheap aftermarket lenses are polarised, gen 1 is not), and also the shape of aftermarket lenses are usually slightly different.
Noticing these small differences usually takes a lot of hands on experience, so you're best bet is to ask someone on the forum that 'specialises' in M Frames.

Happy to give my opinion if you ever need some help