I have bought a few of these as fountain pens. Firstly I don't recommend you buy fountain pen - they're really difficult to get working nicely compared to other fountain pens and performance isn't as high as even some of my cheap ones unlike a real MB which has great performance (with a rollerball just switch in a MB refill and functionally identical).
Secondly - be careful. These are *really* delicate. The snowcap can break on a whim and the whole thing is fragile plastic. Also - don't buy gold plated like fake watches it wears off quickly.
Thirdly - polishing scratches out can be done in the same way you'd polish an acrylic watch crystal - handy to know.
Those issues aside the MB's you can buy are very accurate replications. They pass a bunch of "fake tests" people will apply such as shining a light to see if it glows red, looking under the clip, proportion, umlaut over the U etc. The serial number will be the giveaway since once googled you find other pens with the same #
I'm sorry.
I already bought and received that pen, I probably wasn't clear.
I'm happy with the overall quality but can't say in detail as I never held a gen one.
It doesn't feel balanced and the screw feels like it's going to break the next time you change the refill.
But looking at it results very well finished (logo, incisions, "Made in Germany" under the clip,...)
The writing is not smooth and sometimes, probably depending on the angle, the ink do not come out. I'm used with standard "BIC-like" pens, do they made something like that? The one I got is called "rollerball", which ones should I look for?
Can't find the SN#, where should I look for it?
For less than 10$ I really suggest it as I also have bought a Mechanic pencil from the same seller...