I don't think it's in poor taste... there's an active trading post here and people would actually appreciate it.

The pin count makes it fairly certain it is for an SE/30. It would probably work in a IIsi as well, but the connector for the accelerator is going the wrong direction. I'm guessing they designed the adapter to work with either machine (see the missing connector area for an additional PDS slot that would not work in an SE/30 due to space limitations), but then later decided to make one just for the IIsi since it was a more popular upgrade for that machine.