I have 2 HP-42S calculators with different displays. The older one (by serial number) has a display bezel which is nearly flush with the glass. The newer unit has a bezel which meets the glass at about a 60 degree angle. The newer display seems more readable to me. Both were manufactured in Singapore.
Does anyone know the serial number where the newer displays began? This would be helpful to me as I am considering purchase of an additional unit.
best regards,
Don