The 50 gun ship

This pristine hardback was only six quid in a National Trust second hand bookshop yesterday, which made up for the place being absolutely heaving and not very enjoyable. I don't have any 50 gun ships in my Napoleonic fleets, for fairly obvious reasons, but I quite like the idea of an earlier project, perhaps the War of American Independence or Anglo Dutch Wars, so there's a good excuse for adding it to my reference collection.