Radio Shack EC-291 Owner's Manual page 16

Code
MOW
CAI
HEL
ROM
BER
PAR
3. Press
flashes.
4. Use the number keys to enter the
year, month, and date on the first
line. Then enter the current hour
and minute on the second line.
16
City Name
Moscow
Cairo
Helsinki
Rome
Berlin
Paris
. The first digit of the year