Jaeger-LeCoultre

I bought this recently without boxes or paper. I don't know how to open the case to check the movement. Can you tell if this is authentic based on the pictures? I will see a watchmaker in 10 days to have it open to look inside. Strap is not JLC but buckle...  

this is in my opinion from the photo,s shown a 1990's(93-99ish) model-as the 18k gold body housing the cal 844( base calibre 846) and the stainless steel body with the reverse dial showing the JL instead of the 12 and 6 in the later of case=28.6mm x 20.7... 

Thank you to both of you. I counted all 32 diamonds. What do you mean by colonial cousin?