Originally Posted by SurferRosa

My guess is Gran Sport. You can do a Velobase search to find similar pics.

I've had at least two sets of GS shifters, and they performed just like Record shifters. They're very easy to tighten while riding if need be.

I recently read a tip here on Bikeforums to use a sheet of paper on the down tube when mounting or removing these clamps to protect the paint. And you needn't spread the clamp as much. I did it recently just using a paper towel, and it worked great.

Edit: velobase says they're Valentino Extra.