[Lynn Eades]

There is the possibility a new flat glass has been fitted, or indeed the possibility that more than one type was made. The one in your picture does look to be a straight frame.
The two I bought from Argentina through E bay a few years ago are both curved, and with some spotting to the glass I wondered how I might replace the glass.
These two pictures are my ones ,from one of the threads Hanno listed above. They came in original boxes.