In my experience, you cant get a good idea of a skin fitting from merely a visual inspection.
My fittings were five years old and before I launched the boat once I had bought it, as a precaution, I decided to have the sea cocks changed whilst leaving the skin fittings in situe (a cost saving there as I was assuming that the valves were the component most likely to suffer from dezincification and therefore to fail.
As the yard attempted to free the valves from the skin fittings, many failed and despite looking in good condition, the cause was dezincification!
I would not have believed the material chosen by Bavaria for the skin fittings could have failed after only five years, a component as crucial to the safety of the vessel surely should not be subject to 'cost engineering' when specifying components for a boat.
My recommendation is to remove and replace all Bavaria supplied fittings and stop valves and replace with a recognised bronze alternative... I can sleep at nights now that they won't seize or fail