and it's a fine thing, albeit more of a single purpose device than I had hoped.
Frame geometry is 74.5 degrees parallel, and there is only a righthand downtube shifter boss, suggesting that the frame was built exclusively for TTs, not a pastime that I have engaged in for about 15 years, nor ever shown any aptitude for.
On the positive side, it is as feathery light as you would expect of a 531SL frame, and devoid of rust and dings. Even the Campagnolo Nuovo Record Pista headset seems to be useable.
A previous owner has used a pair of clamp-on shiftlevers, and rigged up a front derailler cable guide under the BB, and being no latter day Alf Engers I will do the same.