Unlike Anaroku's beautiful and focused collection of Calatravas, I have a random and assorted accumulation of pens from England, Italy, Germany and Japan!
The pen with the blue cap is from an English company called Onoto. It's a revived version of a brand that was prominent in the 1920's and 30's I believe. The pen is the Horatio Nelson. It commemorates Admiral Nelson's defeat of the Napoleon's French and Spanish fleet at the battle of Trafalgar in 1805. Nelson was killed in the battle but his flagship, HMS Victory, survived and it is kept in a naval museum in Portsmouth, just along the south coast of England from where I live. Over the years the Royal Navy has renovated HMS Victory and they had about 80 tonnes of oak and 10 tonnes of copper, which was taken from the ship, sat in a warehouse. Before the 200th anniversary of Trafalgar, the Royal Navy sold off these materials to various craftsmen and women. Onoto bought some of the copper and they used it in the sterling silver alloy used to make the pen. It's a great pen. Heavy but with a lovely (German?) nib which I have had tuned. The cap of the pen has an engine turned pattern and it's covered in vitreous enamel.
As it happens, Peter Lloyd, who made my pen box bought some of the oak from HMS Victory and made some jewellery boxes out of it. Unfortunately the wood of my pen box is more mundane and is of no historical significance!
The other pen you mention is a Waterman Serenity in titanium and sterling silver. It was a mistake! I was on holiday in Singapore and bought it based on its looks (which I believe are supposed to be based on a katana) but it is nasty to write with. The nib is very firm and unforgiving and the silver grip section has some sharp edges that dig in my fingers.
All the best
Jon