Found a working direct link to trade the Devcoin token and XLM on Stellar DEX using the StellarTerm website.

Looks like the order books are correct and the issuer is MarkM's account.

https://stellarterm.com/exchange/DVC-GBHAQ252S4Z4AQOM4BWIRC3UHAOJIKCZQBUJGD336YH2O7W2NKRXMHA5/XLM-native