Opinion on Em Tummell signatures
 

Hello, I recently purchased a grouping of vintage cards. Among them are these 4 signed Tunnells. All are live ink as it is hard to make that out on the cards signed in black. I am looking for others opinions on their authenticity. Thank you in advance.
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I would pass if these were offered to me. Most all Tunnell signatures I have seen have some sort of labored appearance. These look manufactured and just don't feel right to me. I am willing to be wrong as I’m not an expert in his signature, but I have bought and sold a few of them over the years.