Penny Postcards 1907 USA To Norway With Postmarks And Stamps From Both Countries

Greetings from Luxembourg!! I'm curious about the numismatic significance, if any, of these two post cards. I bought them with a box of others many years ago at an auction in Ohio.

Both cards were sent from Cleveland, OH, in 1907 to Holmestrand, Norway to a Reverend E.W. Pease.

I've been able to find out a few details as to personage, but am trying to find out if these belong in a museum (donated several World War I postcards locally from the same lot), with someone related to Rev. Pease, the church where he served in Norway or in Ohio in the U.S., etc. If I somehow hit the lotto it would be nice to know as well. I am however skeptical of this. Thanks in advance!

Numismatic relates to coins, paper money, and medals.
When it comes to stamps the word is 'philatelic.'

You have two postcards with a printed franking. The sender underpaid postage using these and additional postage was due equivalent to 5 gold centimes. The encircled "T" stands for taxe, indicating a charge (5 centimes or its equivalent) is due. Postage due labels were attached and cancelled in Norway. Technically, those are not postage stamps. They do not prepay postage.

They might be a nice addition to a postal history collection and, especially, to a collector of Norwegian postage due labels.

They are not something for a museum in general. However, if any museum related to or exhibition about the recipient or sender exists, it might be happy to receive it.

Many thanks for the misnomer correction and the great info! I think I'll continue down the family-related rabbit hole and see if I can locate his descendants and find out if they are interested in them.

The postage for a postcard to Norway was 2 cent and as these are 1 cent postal cards they are shortpaid 1 cent. How international shortpaid mail should be handled were regulated in the Universal Postal Union's convention. In this case the items should be marked by the the US office of exchange (New York) with a "T" and the missing amount in goldcentimes. The exchange rate between US cents and Goldcentimes was 1 to 5 so the missing amount was 5 centimes which is indicated by th mark T 5 Cemtimes NY. When the item arrived to the Norwegian office of exchange this amount should (as a penalty) be doubled and converted to Norwegian öre and this amount marked on the item. The exchange rate was 1 centimes = 0.8 öre so this will be 5x2x0.8=8öre which is maked by blue crayon. On arrival postage due 8öre has to be paid and this amount affixed in postage due stamps.
There is an interesting thing with the upper item as these rules changed on 1 October 1907 when this item was in transit. As from this day the US office should indicate the amount due instead of the amount missing. So after this day the US mark should be T10centimes and not be doubled in Norway. However on this item the the Norway office observed that the card was sent before 1 October and used the old rules.
I am not a major expert on the finanancial value of these items but I think a normal price is about $25 each

Interesting! Thank you! This explains why all the later one cent cards have an additional one cent stamp attached!