I have been interested in these but have done no research until now. I have never spotted any at estate sales or auctions, making them all the more curious to me. We don't know anyone who has been to our home for dinner with moustache, so have never used these. Actually when friend Tom visited last year, I did not think about them or would have gotten them out for his use as he does have a moustache. Sorry Tom, next time.
I believe they are mugs, different for their era because no saucers came with them and they are much larger than the normal china cups with saucers. I remember my Uncle John Irwin would use them from time to time and said they came from his grandfather, the wealthy J.R. Irwin.