I just got a bunch of LMV324IDR rail to rail op amps from ebay. I hooked one up and it seems to saturate 1.3v below the supply voltage (at 3.7v for 5v supply). There is no load at the output of the op amp (just a scope probe, 1MOhm).
This leads me to believe that the op amp might be counterfeit.
Am I right to assume so ? Is there a way to check ?
Edit: As requested a photo of the chip: