Alto relieve en plata de Enzo Romagnoli.

​ Analysis: Renzo Romagnoli
​Company/Artist: Renzo Romagnoli is an Italian master craftsman who started his activity in 1972. He is known for creating high-quality, luxury items, gift articles, and handcrafted game sets, particularly using wood and leather.
​The Artwork Style: The search results specifically mention that artwork attributed to Renzo Romagnoli can be high-relief silver pictures and showcases his skill in high-relief techniques (Source 2.1), which matches the textured, raised appearance of the artwork in your second photo. The abstract nature of your piece could be a stylistic variation.
​The Date: The date '78 on your piece is perfectly consistent with his activity, which began in 1972.
​The Emblem ("Z"): Crucially, one search result links Renzo Romagnoli's artwork to Zeta Studio d'arte in Italy and mentions a Guaranteed Certificate from Zeta Studio d'arte (Source 2.6). This strongly suggests the small, round emblem with the stylized "Z" or zigzag is the mark for Zeta Studio d'arte, the production studio associated with Renzo Romagnoli's artwork division.
​ Conclusion for Your Piece
​The object you have is almost certainly a framed High-Relief Artwork signed by, or attributed to, Renzo Romagnoli, dating from 1978, and bears the mark of his associated art studio, Zeta Studio d'arte.
​While he is more commonly known for luxury board games (like backgammon), the evidence confirms he and his studio also produced these distinctive framed relief artworks. The burled wood frame suggests it is a high-end decorative item.