I know, this topic has been up before. But the thing is that I own an M6 Panda manufactured 1989.
What I´ve read and find out so far is that there was no Pandas around before -91. But I am 100% sure
that my camera is an original from factory camera, based on from whom I bought it. First original owner
and I know when and where he bought the camera, early 1990 in a small town in Sweden.
My guess is that they started to be built in the series 1772501 - 1775000 in 1989.
I have seen other up for sale within that range.
The serial number is 1773xxx
I need to do some more research on this topic.