Actual indicia is Amazing Spider-Man King-Size.
The publication date is likely to be September 1973: the back-cover ad (for Junior Sales Club of America) can be found in 1973 only on the Marvels with September and October cover-dates, but the date can probably be narrowed to the first of those two by the half-page ad on the letters page in September's issue of Fantastic Four (Marvel, 1961 series), #138, which promotes both this King-Size and Fantastic Four Annual (Marvel, 1963 series) #10.
Re-visioning of the cover to Spectacular Spider-Man, The (Marvel, 1968 series) #2.
Pages 1 & 2 and pages 45 & 46 have been condensed to one page each. Pages 4,5,8,9,10,11,17,21,23,24,27-29,33 and 36 were not reprinted. Page 22 panels 2 & 3 and page 25 panels 3-5 are not reprinted.