I personally look for the old old ones with a gate mark in the bottom.
![Image](https://www.tnttt.com/gallery/image.php?album_id=1521&image_id=72752)
It seems to me that the 1870 to 1930 ones were made of much more pure metals. The insides are almost polished while the exterior is rough as 60 grit sandpaper.
![Image](https://www.tnttt.com/gallery/image.php?album_id=1521&image_id=72750)
![Image](https://www.tnttt.com/gallery/image.php?album_id=1521&image_id=72751)
With or without legs no matter. I just add my gas stove grate under the flat bottomed ones.
![Image](https://www.tnttt.com/gallery/image.php?album_id=1521&image_id=76125)
Just in case you are about to tell me "that's a skillet not a dutch oven"
![Image](https://www.tnttt.com/gallery/image.php?album_id=1521&image_id=92377)
I say it's both !
I have found the absence of a trade name is a blessing on the old iron some folks do not have a clue what they have and they will go cheap ( I love cheap)
![Very Happy :D](./images/smilies/econ_goldtooth.gif)