Acrylic lacquer is usually the type of lacquer used for coating metal surfaces for interior applications. It adheres better to metal and is a harder when dried than most other types of interior purposed lacquers.
A good semi-paste chemical paint stripper like Strypeeze or Klean-Strip (not the water based ones) will dissolve most non-catalyst type lacquers. Brush the semi-paste stripper on and let is sit for a few minutes until you see the lacquer starting to crinkle up. If the surface starts to dry-out before the lacquer crinkles brush on more stripper. After the lacquer crinkles or starts letting loose then use a chemical resistant non-scratching pad or scrub brush, or a cotton terrycloth rag, or 0000 grade steel wool (very light pressure so not to be abrasive) along with lacquer thinner to clean off the lacquer and chemical stripper. It may take more than one coating and cleaning cycle. Once you are confident you have all the lacquer removed then clean the metal well with a clean cotton rag and clean lacquer thinner.
Only coat time manageable areas at a time with stripper. You don't want to get more area covered than you can keep up with because if the chemical stripper is allowed to dry up on the work piece's surface it becomes extremely hard and difficult to remove.
Always use chemical strippers and lacquer thinner in well ventilated areas away from sparks and flame. Wear neoprene, chemical resistant gloves and eye protection. And read and follow the safety precautions on the containers.
Most newer silver plate items have an extremely thin silver plating. That is in part why manufacturers coat with lacquer rather than not. The pieces just can't be cleaned much before wearing through the platting. So if your client decides that they would rather have the candelabra recoated with lacquer after you clean it then use a clear acrylic lacquer recommended for metal. These types of lacquer are available in aerosol cans in different sheens.