Airhead 80s valve seat markings

[Airhead Wrangler]

In gathering up parts for the new engine I'm building for my ST I came upon a pair of '83 big valve heads. I picked them up for a song, so I'm OK with plunking down for the right exhaust seats to be put in. However, the valves show basically no meaningful wear so before I throw good money after bad, I'd like to be sure that a previous owner hasn't already put the good seats in these heads. Snowbum's valve/seat article mentions that the bad seats have a single scribed line "on the inside" and the good ones have two. Does anyone have any photos of what these scribed lines look like and where exactly I can find them?