Vennture ING backbore - This is a custom commercial backbore based on a Marcinkiewicz Ingram piece.  
 
Overall mouthpiece condition: Very Good
 
Measured throat: 28
 
Notes: Light insertion marks
 
Photos are taken in harsh lighting to highlight any defects and flaws.  The lighting used also highlights tool marks from the manufacturer.  
 
We want to make sure everything is visible and known before purchase.