What an awkward two weeks this has turned into.
I don't even know how to go about this, this time.
One of the first commissioned keycaps I made was for one of my gasmask designs. I loved making it and the
client enjoyed it as well (sometime in early '10). But it was a closed/private sale, however, after a conversation with that client around December '11, I asked if I could redo the masks as a series (some fun new ideas) if they were different than the one he had. He was fine with it and was interested in getting some of the new ones as well. I sent out some prototypes earlier this year for review, some found new homes but most came back. interestingly one of the last to go out a few months back in the series looks a bit similar to the one you have here. it's clearly not mine but It makes my mind wander... (never a good thing, lol).
Pics or it didn't happen.
Seriously, it would help people decide to support you or not. Ultimately the thing you appear to be trying to protect is based on a stated similarity. If you can show we can judge. Though I suggest this thread is not the place for it. Your subforum may come across as less antagonistic.
Just an opinion - no need for response if you disagree.