J. Peelen - the confusion is over a round tin with a labelmarked for 49 rounds, followed by an uncaptioned picture of an opened 9 m/m tin with 48 rounds. At first thought, they would seem to go together because of the lack of a caption on the 2nd tin.
Now, therein is the confusion, but the truth is, the open box shown cannot be related to the picture above it of the 49-round box, even though their is no caption to say whether it is or isn’t, because the 49-round label, now that I am reminded of the numbering system for the various pistols, must be on a can of 7.65 mm Browning ammunition, since the tin is labeled for the 7.65 mm Sauer & Sohn "Pistool M29 No. 3.
My confusion was caused by not recalling which Pistol was the number 3, along with an un-captioned picture that appeared to belong with the picture above it. It shows that a picture is not ALWAYS “worth a thousand words.” Of course the 28 round (4 x 7) and the 49 round (7 x 7) tins make perfect sense for the Sauer & Sohn 7-shot pistol.
Sorry for the confusion, but I will plead partially innocent on this one. :-)