Hapalua Dala Specimen from Royal Hawaiian Mint Error Set

As previously promised in one of my October blog entries, below is an image that compares two versions of the 1997 King Kalakaua Hapalua Dala. Both coins are dated 1997.  The coin on the right is from an error-ridden RHM set I recently purchased.

As the image of the COA indicates,  only 88 were struck and were serialized (serial number 51 is currently my collection).

The coin on the right has no serial number and came from an error-ridden RHM set (wrong coins in set).

I believe this may be a unique piece without serialization, since it was inadvertently placed in the error-ridden set.