Leave it as is.
5-50 usd
$15 to $40 depending on condition.
There was no 1891 British Two Pound coin issued.
There were no 1891 coins struck.
$1.00
I don't know , I would like to find the value of the 4440 1891 ser 171906
$3.00
5.000dollars
about 13.000 euro
All US coins dated 1891 have the word LIBERTY on them and 4 US Mints were operating in 1891 so post a new question with the denomination & mintmark.
50-100 USD