Pretty broad topic. I live in an apartment so I collect pump plates to display due to space issues. I have plenty of plates and signs to trade or will pay via Paypal, money order, or check.
I'll be HAPPY to look at anything, but I prefer:
Gulf Knockproof
Standard (Red or White Crown)
Sinclair (don't have one yet but would LOVE to get one)
Texaco (SkyChief, Fire Chief, Petrox, any of them)
Of course the price I'll pay varies depending on condition, brand, etc. I typically pay $50-$125. I don't mind (even sometimes prefer) rust, chips, scratches. I love "character" in a plate, but would prefer no pieces broken off, holes, etc. never known though!
Please feel free to post, PM, or call/text 678-232-4637 with pics and/or prices.
Gotten quite a few good pieces from here and hope to add more.
Thanks Oldgassers!