We have repaired light fixtures and chandeliers over the years.  If you found something interesting at the old house parts reclamation yard, we should be able to update wiring.  We don't do any metal refinishing, cleaning, replatng, or major structural updates. We do not have a machine shop or foundry to replicate missing parts. On the plus side, lamps and light fixtures over the past century are largely fabricated with off the shelf parts.  On the minus side, what was common and "off the shelf" in 1945 may be unavailable today.   

In the past, our exposure to European Economic Union standard lamps and light bulbs was limited to customers returning from Italy or Germany with lamps wired for E14 bulbs.  We do have adapters for these.  We now see customers with lamps and fixtures purchased on line.  Some of these units must have been built for markets outside the United States.  Either the adapters or a compete rewiring may be called for.