This mid-60's Lettera 22 was near the end of the line for this venerable design, and this particular example was reputedly owned by Hunter S. Thompson, who allegedly left it behind in a hotel room in Vietnam after skipping out on the bill, circa late 60's. Saw it and heard it's backstory at MTE, as it was in for repairs. Currently non-functional, so no typesample.
I suspect there might be a "9" under that mount point, which would put the serial number past 1964. Squarish keys and "Underwood-Olivetti" labelling suggest around 63-64-ish.
I am a scoundrel without a cause, and my swank outshines the sun.
I am a casual Typewriter Hunter residing in the sweltering deserts of Arizona with a wife, three cats and about 40 typewriters. My main hunting ground is thrift stores, and I rarely pay more than $10 for a machine.
Professionally printed, coil bound workshop repair manuals.