No, Tom, I don't. I pulled these out of a forgotten shoebox the other day and haven't even had time to look at them closely. I hadn't even noticed the IH vs HI! You've got a good eye!
I came across this postmark about twenty five years ago and really liked the little bi-plane. I had always wanted the full postmark but could never locate one. This is probally how I came to collecting First Flight covers. Then in the past two weeks I have come across five of them. I guess patience in this hobby really helps.
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