Wrongly documented TI LM324 unity-gain bandwidth?
They specify a generic GBW of 1.2MHz. This is usually done with no output applied, from what I understand. Then there is the Avd which is max 100K (100 V/mV). This is the open-loop gain measured with a load, so taking into account loading effects, if I get it right


Having a GBW product of 1.2 MHz doesn't mean that there is any frequency where the gain is 1.2 million. Having an open-loop DC gain of 100 V/mV doesn't mean that the gain must drop to 0 dB at or below 100 kHz. 

Assuming this is an old-fashioned dominant-pole-compensated design, you could imagine that the DC gain is 100 V/mV and the dominant pole in the open loop response is at about 3-4 Hz, so that the response falls of at 20 dB/decade to reach 0 dB at 1.2 MHz.