1. Model: Sanctus Seraphin made several different models of violins, some of which are more rare and sought-after than others. The most common models include the Guarneri, Stradivari, and Amati models.
2. Age: Sanctus Seraphin violins were made over a period of several decades, and the age of a violin can have a significant impact on its value. Older violins are often more valuable, especially if they are well-preserved and in good condition.
3. Condition: The overall condition of a violin is another important factor in determining its value. This includes the condition of the wood, varnish, and fittings, as well as the presence of any damage or repairs.
4. Provenance: The provenance of a violin can also affect its value. Violins that have a history of ownership by famous musicians or have been played in important concerts or recordings are often more valuable than those with less distinguished origins.
It's important to note that the value of a Sanctus Seraphin violin can best be determined by a professional violin appraiser who can assess the instrument in person and take into account all of these factors.