Its fun finding out the history of your aeroplane.
A number of years ago I had travelled to Denmark to look at a KZ-3 that was for sale. Neat aeroplane - I believe there are 2 of them here in the US. On returning home, my then boyfriend had done some research at the National Museum of Flight in Scotland where he was the curator, and found an old copy of Flight International magazine, with photos of that same plane at Gatwick airport in the late thirties when the airport was still a grass runway. I didn't buy the plane, but we did send copies of the photos and article to the owner.
I used to own a 1965 Nanchang CJ-6A, and when I bought it in Scotland, in amongst all the papers & logbooks were some photos of the aeroplane whilst it was still in China. When we moved to Oshkosh, bringing the Nanchang with me, I bumped into a photographer for the local newspaper who is Chinese. I took the logbooks to her and she was able to translate the writing in the logbook, where one page had beautifully written, in red ink, what she described as a quote from Chairman Mao, with words to the effect that all good young Chinese men must stand up and fight for their country. From the dates on the photos and the dates in the logbook, she was able to tell me that the photos were of the Chinese test pilot doing a pre-export approval/test flight. Pretty cool to have that history. I made sure everything went with the aeroplane when I sold it, and I hope subsequent owners will do the same for future generations of owners.