13x e14 socket. Works with 220v and 110v. our lamps are checked, cleaned and are suitable for use in the usa. delivery without bulbs. I have official proof of authenticity such as vintage catalogs, designer records, or other literature sources and take full responsibility for any authenticity issues arising from misattribution, up to 250v (europe/uk standard).the wiring of this item may be original and might need replacement, if not specified otherwise.