Just got into watches and I think I bought a fake? Help!

[enype]

So i recently bought an AP on ebay for very cheap. It did not come with any papers, but the guy I purchased the watch from had very high feedback. he said it was authentic, but he got it as a gift from a friend. I was scrolling through the rest of ebay and found a clone watch that had the same serial number and case number as the watch that i purchased. Would this mean the watch i purchased is either fake or a clone watch as well. any information would help greatly. thanks!

i was planning on taking it to a specialist but i figured to try this fourm first because google didnt have much info on this.