I have a first edition Monster Manual/Handbook. It was a hand-me-down from a family friend. I loved reading and re-reading it and, yes, my younger brother colored a few of the pictures in. I didn't even know how to play D&D.
I should still have it. The cover was in pretty bad shape (hundreds of tiny indentations/pock marks).
Oh, and the original coverart was far superior to these reprints.