These are usually listed as Yugoslavia forerunners which are placed before Yugoslavia such as for Slavonia-Croatia and for Slovenia. These appear to be postage due stamps.
I didn't post earlier because didn't have the opportunity to check Michel.
You are correct, that neither stamp is listed in Scott.
For the 6 fillér overprinted postage due stamp, there is a note in Michel that states the 5 & 6 fillér stamps were unauthorized printings. The 2006 Michel South Europe catalog does not assign a catalog number.
The BOSNA // PORTO overprint on the Chain Breaker stamp is a local/provisional overprint. I know it exists for several denominations, but I do not have a catalog that lists them.
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Posted 06/19/2014 7:04 pm
