The yellow book says 1BTC Brass 2013 v2 was 8352 minted so the most prevalent of all the brass 1s. https://coinfirm.org/wp-content/uploads/2016/06/The-CoinFIRM-Casascius-Guide-v0.11-4.pdf

Search shows none of the 13 v2s in the last 6 months, 1.1 seems like a very good offer to your friend depending in condition.
Rarer Brass 1s have been going for not much more.


someone far more knowledgeable than me will hopefully chime in soon.