I think I'm out of luck.

I encrypted the wallet and I started to bet satoshi dice. All payments are done to the encrypted wallet but I have 4000 movements and the wallet.dat backup it's from movement 0. So I think I definitelly lost the btc. Well, Now I know a bit more of bitcoin system
Fortunatelly I keep 50% of my winnings before start this new wallet.

by the way, I don't delete .bitcoin/ directory, I just move to .bitcoin_old1 .bitcoin_old2 ... to keep it just in case.

The problem here is the backup it's too old and it doesn't has the addresses with the incomings good to know for the next time.

Thank you to all for your help!