Graded Buffalo Nickels And 10 Cent Coins In European Auction

Hello,
As an existing client, I am invited to bid on the imaged coins here in an auction in Europe. They suggest that these are fairly rare and hard to come by in these grades.
WOW, looks like SPG should be grading all my coins....LOLOLO. they are "better than NNC (Centsles)
However, I am not in to US coins at all, unless it is worth my while.
Canadian coins, old ones, are my turf.
looking at thes coins, one must wonder about the grades.
I have the following questions:

Are these coins worth bidding on?
and if yes, what are they worth?
Oh, grades? 69? NOT, maybe AU 50?

thanks for all your help

PS: if any of you are interested, please PM me.
Auction is NEXT week !