At it's very best this rifle is worth $18 in Very good condition. It is not worth repairing.
The U.S. didn't exist in 1700.
There is no gun tower on the Berlin Wall
Wall hanger to 100 USD
Wall hanger to 100 USD depending on condition
By hand
As exchange rates stand today, £1700 (GBP) is worth roughly $3375 (CAD).
No U.S. Nickels are dated 1700. The first nickel was issued in 1866.
Best bet is to hang it on a wall. Not worth more than 20-30 USD.
It is valuable if washed with a garden hose and hung on the wall as a conversation piece.
1 penny
about 5,000 dollars