Quote:
I think I speak for everyone when I say 'bring it on'.
Very kind. But don't say you weren't warned....
Next up is POSTAGE DUES FOR POSTAL TAX
Yugoslavia had a system of levying postal tax for social and charity work. They regularly nominated a week or fortnight when there would be a postal tax for a named charity (usually Red Cross, TB, children's charities, and in more recent years cancer and AIDS.) During that period all letters had to carry an additional special charity stamp (usually of a comparatively low denomination) all proceeds from which went to the nominated charity. Any letter in that period which did not carry such a stamp would be regarded as understamped, and instead the recipient would be asked to pay the tax before the letter was handed over. Note that unlike normal postage due they did not have to pay double.
This is what is supposed to happen:

Ordinary stamp for 3.5 dinar + charity donation of 1 dinar to Red Cross. Everyone is happy.
However:

Ordinary postage of 50 paras only is paid. The sending office marks it with the Taxe handstamp; so the recipient has to stump up the 20 paras to pay for the charity stamp affixed at the receiving office.
In some but by no means all years they actually issued not only the charity stamp itself but a matching Porto stamp for collecting the postage due:

Obviously this is just a philatelic cover; a real cover could never contain both. So here is the real thing:

In the absence of the charity stamp (left) a charity Postage Due (in this case same design but overprinted PORTO) has been added to the cover. Note that the card is from abroad, but a Yugoslav still has to pay the tax to get it delivered!
However since the money from all the charity issues, postal and postage due, were going to the same organisation, post offices weren't always very exact about which stamp they used:

Although a charity postage due (left) was in use in this period, it has not been used; instead the charity postage stamp is used as a Due.
And conversely:


Two examples of Charity Postage Dues being used as Charity Postals by the sender (presumably that's what he was given by the postal clerk).
The first illustrates that this postal tax system was not a Communist Plot. It originated under the monarchy.
That's enough for this week. Next week I might dip my toe into the murky waters of provisional postage due overprints.