Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums General Petroliana Discussion DX patch original NOS ? DX clothing questions

I bought this on Ebay. Can anyone confirm is this is true NOS? I'm happy with it either way, I just want to learn.

https://www.ebay.com/itm/227462455187

Also, are there known pictures of original DX work shirts? Was the "Known by the customers we keep" patch real or made up for the movie The Outsiders?

Lastly, where was the last DX gas station? Or was it a mass rebranding and there was no actual last one?

Thanks for any help