Is this a Linhof Technika III lens board or something else?

[dachyagel]

I have an LF lens on the way from the auction site and will be pulling it off the lens board it came with as it won't fit my Super V, but I'm not sure if it's a Tech III lens board or something else, as I've never seen cutouts like these along the bottom of a III lens board. Can't see it in the attached photo, but it does have the tiny little arrow notch in the center of a III board. Based on the lettering of the logo, I assume it was manufactured in the 1950s.

Any ideas?