The article is a little misleading on that point Chet, while it's true that there were only 75 Mk1's built, the total production run across all Mks were nearly 800 (most numerous and considered the 'definitive' Sunderland was the MK III of which about 460 were built). There are a few complete examples about the place, with the one at RAFM Hendon and another at IWM Duxford the only ones I can recall at present. I like 'em.