Assuming you are referring to a genuine Stradivarius violin made in the year 1746, the value would depend on the specific condition, provenance, and other factors that affect the value of rare musical instruments. It's important to consult with experts and professionals in the field of antique musical instruments to obtain an accurate valuation.
Based on recent sales and market trends, authentic Stradivarius violins from the 18th century can command very high prices. Some have been known to sell for tens of millions of dollars in specialized auctions or private transactions. However, the actual value of a specific instrument can vary greatly, and it's crucial to have it evaluated by reputable appraisers or dealers who specialize in rare violins.
It's worth noting that there are also many imitations and copies of Stradivarius violins circulating in the market. Distinguishing an authentic Stradivarius from a replica or forgery requires careful examination by experts who are knowledgeable about the materials, craftsmanship, and unique characteristics of his instruments.
If you are interested in learning more about the value of a specific violin or considering buying or selling a rare instrument, it is recommended to consult with recognized experts or auction houses that deal in valuable musical instruments.