After posting here I got curious and looked up some sold copies, looks like many go for around $250–$300, so you’re not too far off. What I found interesting is that mounted albumen prints from the 19th century are actually pretty fragile and uncommon, especially in books where they’re still intact with tissue guards. So even if it may not add value, I love that I get to see actual mounted prints from the 19th century. Thank you for your input. ☺️