It's an
SCM50ASL I think. The product pictures show a cap over the midwoofer port (?) which is removed in the video you mentioned.
In the video the logo plaque is silver instead of black and there's a blue sticker in the bottom left corner (some calibration sticker perhaps?), so could be an earlier revision of the same model.
Edit: here are photos of the SCM50ASL with the silver plaques:
The ATC SCM50A Pro is a 3-way studio monitor capable of delivering the performance you deserve from an ATC SL 9" driver, a 75mm mid and and a soft-dome 25mm tweeter, powered by an onboard 350W tri-amp.
www.kmraudio.com