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If you cannot find enough identifying marks/numbers/names on it to identify it then you need to identify the chips on the board and trace out the circuit from the drive chips to the external connections.
As tpetar said, some good photos might help. When you say "(3x16)" - what exactly are you referring to? Numbers of pins? Display size (do you mean 2x16)?
Many small LCD displays are HD44780 compatible, often with the semi-standard pinout too.
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