This is an overview of the a386 case. There are three different types of the a386 MarkI markII markIII. The first mark I case numbers 538dxxx to 539dxxx have a plain case back and no groove on lugs [see pic of the case with the blue highlighted around the lugs] more about this case later. Mark II case numbers 706dxxx to 708dxxx have a plain case back and a groove on the lugs [see pic of the case with the red circle highlighted around the lugs] Mark III case numbers 861dxxx to 233Exxx has a four pointed star on the case back and a groove on the lugs [same pic highlighted in red ] There is a great tread which lous made about the a386 case backs on the site for futher reference,the correct crown for all three references have a four pointed star and a circle around it now back to the markI. The first a386 case the mark I has a different design case to any of the other a386 cases. If you study the case from the front you can see at the point where the lugs meet at the top of the case, the lugs spill over onto the top of the case uninterrupted. Also the bevel edges on the side of the lugs run the full length of the lugs up as far as the top of the case. These features give the mark I case a far smoother flatter look than the mark II & mark III cases which have a groove on the lugs at the point where they meet the top of the case. This groove also acts to interrupt the bevel edge on the side of the lugs from running the full length up as far as the top of the case/bezel. To sum it all up all a386's are colllectable, very collectable but OH BOY the one to look out for if you can find it is the first a386 case, the mark I with case numbers 538DXXX to 539DXXX. Out of the 2500 a386's made, production for the first mark I is somewhere in the 200 to 400 range I estimate from sightings on the web and how seldom they appear on ebay HAPPY HUNTING.