How to confirm the make of transistors!


I just had a friend pick me up some OC75's for a build I might be making! I just want to make sure these are the Philips as advertised, don't have pictures but it's the typical Black Sleeves, it says OC75, has codes that says B20 or 29 or something, and a red dot on the tranny, looks legit but I am not experienced and want to see if there are any other ways to tell!
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Oh look! This is a thing I can change!
There really arent many makes of transistors like that. Its either going to be philips or mullard and i would be surprised if anyone is actually faking them as it would be super expensive to make them in the first place.

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