Silver-plated liqueur set

Nice liqueur service that will need some care unless you like the patina of time on silverware. It consists of a tray with a frieze all around and two chiseled handles and 10 glasses or small cups on feet, of a nice finesse repeating the same pattern on their edge. We can see two letters on a handle of the tray, "AH" perhaps. The whole is in silver and gold metal, difficult for me who is not a specialist in this kind of object to say what metal it is. What I can say is that as it is the feet of the cups are rather gold (original or not?), the cup itself is silver. I cleaned one (with Argentil), the cup became nicely silver again (fewer black marks), the foot is now more silver but still with gold highlights (see the photos with several glasses to compare). The tray is silver and gilded in places, impossible for me to say what its original color is. And when you hold the cups in your hand, you feel a certain weight at the foot, good stability of the cups therefore. The whole is in good structural condition, no deformation but has the patina of time and traces of use: areas of black coloring, stains, the tray also has some scratches. A good cleaning by a specialist would surely do a lot of good for this service. The tray measures 30 cm in diameter, 36.5 cm in width including handles, the cups measure 9.5 cm in height, 4.2 cm in diameter.