The first known sighting was reported by a British brig in the waters between Menorca and Majorca; it was a small and fast armed Xebec, whose crew responded to the British vessel requests by raising a courtesy Union Jack on their foremast as a salutation, but ably avoided all the brig's approaching attempts and quickly disappeared eastwards into deep waters. That same ship was a few days later reported by a Genoese merchantman to be sojourning in the Sardinian harbour of Alghero -apparently undisturbed by the local authorities. A third sighting was reported by a Provençal tuna fishing ship, whose captain stated the xebec was undoubtedly heading towards Monte Cristo waters.
However, identity uncertainties didn't last too much, for soon it was delivered an official message to all Southern European chancelleries from the Catalan Parliament -except for the Bourbon Spanish ones, to be honest- containing a formal notification of the new naval war flags adopted by this Principality, along with their detailed description. A few days later, ships from Majorca island were also reported to have switched to the new set of flags, as well as those from Sardinia -this seemed to reflect some kind of consent by the Holy Emperor Charles VI, for both islands were still garrisoned by Imperial troops, so that diplomatic unrest among most Mediterranean chancelleries began fading soon.
Related entries in the Defiant Principality blog: 1713 New Ordnance on Naval Flags and A tense War Council.