* Year of manufacture: Older Martin HD28LSV guitars may be more valuable, especially if they are in excellent condition.
* Condition: The overall condition of the guitar, including the body, neck, fretboard, and finish, can impact its value.
* Features: Guitars with special features, such as rare woods or unique finishes, may be worth more.
* Provenance: Guitars that have been owned by famous musicians or have a unique history may be more valuable.
It's important to note that the actual value of a Martin HD28LSV guitar can only be determined by a professional guitar appraiser. If you are interested in buying or selling a Martin HD28LSV guitar, it is recommended that you consult with an appraiser to get an accurate estimate of its value.