zOwie Omega Discussion Forum

I recently purchased an Omega Constellation Double Eagle Co-Axial watch from a grey market dealer on the internet. When I received the watch it came with all the boxes and manuals and serial number intact, so I didn't have any doubts about it being authentic. However, after wearing the watch for a few days I noticed that there were a few tiny specs on the underside of the crystal, so I contacted the dealer and arranged to send the watch back to have it cleaned. After about a month I received the watch back and the specs were gone and everything appeared to be fine. Now I'm noticing that the watch is losing about 16 seconds every 24 hours. It is my understanding that the co-axial should only lose 4/6 seconds per day. Should I be sending the watch back to have it looked at again or will it correct itself after being worn for a few months? Should I be concerned that this watch is not an authentic Omega?