If the addresses you have in your wallet show balance and transactions, but those same address have zero transaction history on a Bitcoin block explorer, then that pretty much confirms that nc50lc was correct and you have most probably loaded an altcoin wallet into Bitcoin Core.

You can dump the wallet using PyWallet to see what the addresses are... The address prefix (first characters) should hopefully give you a clue as to the coin type...

Refer:
https://bitcoin.stackexchange.com/questions/19589/how-to-determine-what-type-of-coins-a-wallet-dat-contains

You can also use the "strings" method... Open the .dat in a text editor and look for "names" field. Refer:
https://bitcoin.stackexchange.com/questions/57122/have-a-bunch-of-wallet-dat-files-what-alt-coins-do-they-have-and-may-be-how-mu