Yes, that's a Tech III. Look at the camera reviews on lfphoto.info and the Technika pages at cameraquest.com for more info on the camera and which of the five versions of Tech III it is.
Linhof service will no longer grind cams for Tech III's but I think there are a couple of independent repair shops that will do this. You don't need a cam to focus with the groundglass, but being able to use the rangefinder is a big plus.
From the picture it looks to be in nice shape, but check the bellows for leaks.