Yeah, Panasonic sells electrolytic capacitors in bulk packaging.
They also sell some series of capacitors without any branding whatsoever, for example the FR series. You know they're Panasonic by the vent shape and by buying them from a reputable distributor...
The M logo is not the code for tolerance (+/-20%), it's the Matsushita logo like others said... though I have to say usually the "legs" of the M are slightly more curved normally. Maybe it's a limitation of the printing process, or the logo is changed to fit in smaller vertical height considering the small diameter of these capacitors... I don't know.
Anyway, unlikely to be fake... not sure who would fake 85c rated capacitors when they can fake more expensive low esr 105c capacitors...
ps. bulk capacitors can be easily used in assembly lines where you have 10-20+ persons each with one job, like placing an inductor, placing 3 capacitors, placing a heatsink etc etc ... no sense to use lead tapes and whatnot, it would only slow down the process.
See for example from around 5:20 .. even Gigabyte used to make motherboards around 2012 by placing some components manually: