German 100,000 Mark Note

Hi there. First post. I know absolutely nothing about numismatic properties, so I might be asking a stupid question, but I thought I'd ask, on behalf of a friend, what the possible value of an old German 100,000 Mark note might be.

I don't have a picture to show, sorry. I was at a friend's grandmother's place this weekend & it was raining, so she brought out the coin box. The house has been in the family for several generations, and they have a little box of odd coinc that have been piling up for ages (some date back to the late 1800's from as far away as Hong Kong - we're in Canada, btw).

Besides a gold US $5 coin circa 1910, the most interesting thing I saw was this note that didn't have a date but said it was worth 100,000 Marks. I'm guessing it was printed between the wars. The person on it definitely isn't from the nazi regime. He looks more like a poet or a philosopher and has a relatively floppy hat on his head, sort of like a British cabby hat or that ugly thing Brad Pitt wore when he was doing his thing for the Katrina survivors.

It's a 2.5 hr drive, so I doubt I'll be in their neighbourhood any time soon to take a proper snapshot, but if there's a possibility this bill could be of any value I'd be sure to advise them accordingly.

I'm guessing it might be from some period of hyper-inflation (hence the high denomination), but I'm curious what the more informed (you folks) might have to say.

For clarification, I'm not trying to bilk a sweet old lady out of anything. She doesn't have a computer and I'm just seeing if I can help her discover some equity she didn't even consider before.

Thanks.