Hi Fred,
The keyboard character set seems pretty standard - though I do notice that it has a United
Kingdom currency symbol (£) but has a US power cord and is wired for 110 v.
I did find an image of a Flexowriter with two front panel lamps in this document, p32,
image on p33
https://bitsavers.trailing-edge.com/pdf/friden/brochures/SP9012_Friden_Data…
Seems like the extra lamp was associated with verification of control tapes for
numerically controlled metalworking machines. Though from the description the machine
that I have is different again (my machine does not have an ERROR RESET button)
Machine front panel switches are
(left side)
START READ
STOP READ
SINGLE READ
NON_PRINT
(right side)
[blank]
OPT STOP
CODE DELETE
RUN OUT
So the mystery still remains
Peter