3 x "RESTRICTED" Naval Flight Engineer's MAINTENANCE SHEETS (post WW2)
They would all appear to be from around 1960 as one of the sheets refers to a 1951 manual but has a stationery printing date of 9/60.
There are some minor ink marks here and there and one has some calculations on the back (see photos).
Each measures 33cm x 20cm but will be posted folded in half as per their existing crease lines.