I'm looking for information regarding how to identify Bayer and BASF (and other ??) Test Bricks from regular Lego Bricks. Some Test Bricks are easy to identify, like fx Bayer bricks marked with letters on the studs (or a mix of letters, Lego logo, letters+numbers etc), but how about bricks with Lego on the studs + single numbers ''inside'' each tube and no ''pat. pend.'' text ?? are they also Test Bricks ?? and if they are, is it then Bayer or BASF Test Bricks ?? and how about the two bricks on the pictures ?? they also have no ''pat. pend.'' text, they are numbered at top with 3001 and with 1-177 at buttom. I have seen these been sold as ''complete (Bayer or BASF ??) Test Sets, containg bricks numbered 3001 + 1 to 4-###, but I have the same bricks numbered 3001 + 1 to 8-177 ?!? Well, for me it's a huge mystery, with 100's if not 1000's of bricks I can't determine are or are not Test Bricks - I hope I can find help here to get closer to solve my ''Regular Bricks vs Test Bricks''-mystery....
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