Miller Beer Mirror since 1855 with a bald eagle

I believe that this item could be a collectors item I imagine it is at least 20 or more yrs old... It belonged to my neighbor who had it for at least 10 or so yrs... he was evicted so he left all of his belongings behind... It is a mirror with most of it printed on the actual mirror except the bald eagle is some sort of paper print that is pasted on from the back and shows through the mirror... I would just like to find out if this piece is actually an antique or collectable... thankyou so much... I am planning on selling it but I want to make sure I actually know how much it is worth so that I don't over charge or completely undercharge.  Thankyou for your time!

Sincerely,

Kristen Williams