15 Consecutive Serial Numbers Silver Certificates

I was wondering if anyone could let me know what they think these are worth. I am supposed to meet someone Friday who may be interested in buying these from me or trading me for some coins. He is not a dealer, but I know has been collecting notes for decades. He is a friend of a co-worker so I don't know much about him and I want to give him a price, fair for both of us or an equally fair trade and I don't want to get ripped off.

15 1957B Silver Certificates with consecutive serial numbers.

To my untrained eye, the are perfectly flat, have sharp corners and are crispy as potato chips. They are sharp and vivid with very well saturated blue printing in case the picture doesn't show that.

Because of the crappy lights I had to use for this picture, on my monitor there appears to be a faint reddish cast in the left upper corner. This is only the lighting, there is no cast of stains anywhere. They are clean.

I tried looking at the Heritage Auctions Archive but quantities and/or years differed so it was hard to tell. I assume that the more notes in sequence you have, the greater value each note has.

Any info would help.

Thanks.