Omega seamaster 120m 2511.81

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Hi! I am out after used omega 2511.81 120m
I have found via chrono some good deals for about 1000-2000$ (quartz), questions :
1. when did they stop to produce this model? My understanding is that aqua terra replaced this model but i see that from Japan you can buy model from 2013 as an example. Fake? Pappers and box included, no certificate. Å bit confusing as well that some models from 1998 for example sells more expensive than some models from 2006...
2 i see even models without waves in blue dials, are those fake?
3 if i buy say 10-30 year old model do you think that certificate box papers is a must or is it ok to see if reviews for company are good and buy even without certificate box papers.

Thank you