Thank you Hose. Interesting comments on the coin. I had not considered its value (or non-value!!), but it is nevertheless a nice looking and quite large and heavy coin.
Regarding the spoon, I have found a letter F in Boje's book on Danish Silver marks, for assay master Jacob Fabricius dating 1827 - 1831. This mark is very similar to the F mark on my spoon. My personal view is that the spoon is later than this and I agree with your estimate 1880 - 1920. However, I have another Danish spoon that also looks to date from around 1900 that actually dates to 1840, so could possibly date from around 1830 ? See attached photo.