1 CENT PRINTED MATTER RATE PER 50 GRAM
Most DWI postcards mailed in the early 1900´s foreign destinations were from tourists and were mailed to Europa or the USA.
The UPU had 2 cents foreign mail rate for postcards, and most foreign postcards with a bisected stamp had no massage and was philatelic. The printed matter rate was 1 cent for the first 50 gram and 2 cents for 51-100 gram. A postcard with no massage mailed overseas - was overpaid by 1 cent since it qualified as printet matter which only required 1 cent postage.
During the 1 cent stamp depletion period, senders had no choice - but to overpay with a bisected stamp or pay 8 cents first class postage.
Please also see the page 4 RINGS/LETTER BOX
PRINTED MATTER - UNSEALED ENVELOPE TO KØBENHAVN - 1 CENT 0-50 GRAM RATE
The printed rate could only be used if the envelope was unsealed and did contain printed matter. Printed matter could be something as simple as a wedding announcement. It is not likely that the post office would have allowed empty envelopes to be mailed with only a bisected stamp. Overpaid with 1 cent.