One sure way to find out what you have there. Unscrew the case and look inside. I collect vintage lighted signs and they are graded by value based upon originality. Many originals being sold have refurbished light bulbs starters, cords, and on some light units the entire display fascia is replaced.
Originals will typically have a UL (underwriters laboratory) tag inside.
Without taking it apart, If it is all original and vintage it should have a slow non electronic starter inside. One way to check without disassembly is to closely observe when you light it. When voltage is applied there will be a slight delay followed by a flash or two and you will hear a "dink-dink" noise from inside the unit.
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