Gary, your last bit of info on the NWT and its various release dates is correct. About 1963 they also released a thick volume containing all of the original releases, with the same size font.
The Society actually often used a number of Bibles until the NWT was released in final form in 1961: King James, American Standard, Rotherham's, Young's Literal Translation, Darby, The Emphatic Diaglott, Leeser's, and occasionally any number of others.
AlanF