Production dates for Kelsey Excelsior Model U

Not sure where to post my questions since it’s not about identifying a press, but rather identifying the years of production for a model.

Can anyone provide the years of production for the Kelsey Excelsior Model U (5x8)? I’m demonstrating the press at a book festival tomorrow and would like to give a bit of history about it. I’ve scoured the internet with google searches, and come up with nothing.

Thank you!

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