hello,
I have a question about the watermark paper of stamped envelopes with a year in it. I guess the years were not separated very exactly and the paper of the previous year was also used in the next year? I show an example of U231 with a 82 year watermark 6.
So was this a "late use" of this 1882 paper (after Nov. 83), or was it an "early use" of the U231 (before Nov. 83)?
Thank you!

