Does anyone know what year this Kelsey Letterpress was manufactured?

There was some discussion on this topic a few months back. Here is the thread to the discussion.
http://www.briarpress.org/5829

The press in the photo is a Kelsey Excelsior 6x10 Model X - you can tell by the roller mount system. As far as I know, this is the last Kelsey press developed and was sold up until the early 1980’s. I don’t know exactly when the Model X was introduced, but I would guess it might have been in 60’s. I will have to speak to some of my contacts from the Kelsey Company to confirm this, but my best guess is that it was most likely made between 1960 and 1980.

- Alan
http://ExcelsiorPress.org/kelsey.html