The early Electro-Chrons seem to be characterised by:

• Those wacky hands that everyone loves.
• Dial markers at hour and minute intervals
• "ELECTRIC" on the dial (started to change to "ELECTRO_CHRON")
• Cases with removable backs. Most seem to take the large WD-5 battery on the inside of the case back but I've seen at least one early Electro-Chron that took the smalled WD-4 in a small battery compartment on the outside of the case back.
• Landeron 4750 non-hacking movement.

Below is selection of photographs of these early Electro-Chrons. Even in this bunch, there is variation: it is thought that those dials marked "ELECTRIC" are earlier than those marked "ELECTRO-CHRON". The black dialled version is quite rare; most that you see for sale are white dialled.