"Postage Due 2 Cents" Marking On 1 Cent Postal Card, Domestic Use 1950 : Request For Help

Dear experts,

The image below is a 1c postal card, domestically used in July 1950, returned to writer with large pointing hand markings, with additional "POSTAGE DUE 2 CENTS" marking.

All of my other returned-to-writer 1c postal card bears postage due 1 cent marking (with or without 1c postage due stamp), and thus I am confused why this particular example bears "DUE 2 CENTS" instead of 1 cent due.

Any insights are welcome. Thank you very much in advance.

- Hironobu

I suspect that the "return postage guaranteed" on the face changes the status and the rate.

Can you show the message side?

Dear revcollector, thank you for your insights!

Considering the "Return postage Guaranteed" notification, my other examples from the same writer/sender, with "Return postage Guaranteed" bears a postage due 1 Cent markings (as shown below), thus I reckon this "Return postage Guaranteed" is not causing the difference. So still struggling for an understandable reason...



- Hironobu

Dear Parcelpostguy,

This is the reverse side.



I don't find anything special or particular to make a notable change in the postage rates, and furthermore, the another example with 1 Cent Due shown in my previous post (as a reply to revcollector) has an identical content, which may also prove that the content itself might be not the reason for this "2 Cent due".

Thanks for your insight!

- Hironobu

Perhaps the original sender actually had TWO of these returned post cards on the date that this marking was applied. When he picked them up at the post office, or from his carrier, he may have paid the two cents, but the clerk/carrier did not apply the stamp to this card, but the other one. Or not at all.

Dear mml1942, thanks for your insight!

I also have thought about the possibility to be the "top of the stack" use for a stack of two postal card, with 2 x 1 Cent = "2 Cent due" markings - however, I am a bit dubious about this as a "proper" procedure, as

1) my other "top of the stack" covers bear the correct postage due inscription/marking for one postal matter, and if necessary, have manuscript inscription of the number of the identical ones (and the total amount due for the stack), and

2) those "top of the stack" material do bear postage due stamp(s) to meet the total amount due (there should be some exceptions)

Of course, the postal clerk or the carrier might have been lazy enough to skip those procedures and made a shortcut.

Another possibility might be that the post office mistakingly has applied the "2 Cents due" marking instead of "1 Cent due".

The mystery continues...

Thanks again.
- Hironobu