Where can you find info and parts for a Sears Roebuck Ted Williams model 3T semi auto 22 cal?

try numrich.com or e-gunparts

also try brownells.com

both are major parts suppliers

That should be a Winchester Mod 190. Go here for parts: Numrich gunpartscorp.com

Jack First jackfirstgun.com

Bob's Gun Shop gun-parts.com

That should be a Winchester Mod 190. Go here for parts: Numrich gunpartscorp.com

Jack First jackfirstgun.com

Bob's Gun Shop gun-parts.com