Hi Hans,

The attached scans show the following:

#1)   Museum scan of the 50ore print 8 pos. 28 RM5B.
#2)  Scan of one of two used copies of the same print and pos.
#3) Enlarged view of the upper left corner and the oval coloured
    marking on the two stamps.

The are also two different oval markings outside the frame on both
print 8 pos.66 and 82 although I have only seen them on the Museum
sheet.  Has anyone found similar markings in their collections?

Best wishes,

Ed Mildenhall