The Mudcat Café TM
Thread #173889   Message #4226218
Posted By: Backwoodsman
25-Jul-25 - 03:12 PM
Thread Name: Martin Serial Number breakdown-update
Subject: RE: Martin Serial Number breakdown-update
”Incidentally, does the guitar have a single or dual acting truss rod?”

Martin changed to two-way rods in the early/mid 2000’s. Fred’s is a recent D-18, it will have the two-way rod.

My HD-28V is a 2010 and my D-18 is a 2012 - both have a two-way rod.