I suggest putting the photos in the Classic and Vintage section with a request to help identify. Do any of the tubes exhibit any identifying characteristics such as internal grooves or "rifling"? That can help determine what the tubing is and that can sometimes help narrow down the brand. Another thing is the seat post size. What size post does this frame take? That will also narrow down the type of tubing. Sometimes it is a matter of taking all of the above into consideration and then making a "best guess" but certainly going through the process you can eliminate some possibilities immediately. Other things to note are the composition of the BB, the spoon-shaped top of the stays, the two holes on the head tube for the badge. That last item alone will eliminate many makers.
Last edited by TugaDude; 02-10-20 at 09:03 AM.