My 'new' 1943 Anniversary Speed Graphic came with six 4x5 filmholders. When checked in the darkroom they were loaded. The film feels dusty and has square notches. The camera itself looks like it had not been opened in many years, as it was dirty outside but very clean inside. Any ideas what type film this is? It may be unexposed, as the white flags in the filmholders were out. It may be fogged, it may be dead. How best to develop it to find out? If it's old enough it could be ortho...develop with safelight on? Advice sought!