It does look like an ATR TB - identical to one i have here
The type S TB is this one here listed in for sale section by Ratty
http://www.ludegeneration.co.uk/prelude ... 20128.html
The Types S TB looks identical to the 62mm TB found on the H22A8 5th Gen
Looking at the pics in vtecmecs wanted thread where he has a picture of the ATR & 4Th gen std 60mm TB side by side it does look like the ATR is quite different, with a small or non exsitent fitv, no idle adjust screw and no vaccum picup at the front which i think goes to the evap canister - the body of ATR TB looks shorter as well so you can see why its doubtful it would work...
http://www.ludegeneration.co.uk/honda-p ... 20600.html
There must be somebody out there with a ATR intake mani that would want the ATR TB to go with it - you would need a P28 or similar chipped ecu and a tune to get the best out of it on a prelude.