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Guitar Care

Customer Service

We receive a high volume of daily phone calls and emails. Please note that the answers to many questions can be found here on our website, such as dealer locations, service centers, and model specifications. We will do our best to answer your questions in a timely manner. Thank you.

Appraisal of used Martin instruments - We would ask that you contact an independent appraiser for the current value of your guitar or refer to the "Blue Book of Guitars". Many factors are taken into consideration when appraising an instrument, such as the model, woods used in construction, and original condition. As a manufacturer of new instruments, we do not follow the used market, so we are unable to evaluate or appraise our guitars on the current market.

Technical or troubleshooting information - To assist you in the best possible manner and due to the many details required to troubleshoot guitars it is recommended you contact our customer service department by telephone between the hours of:
8:00 AM - 5:00 PM (ET) Monday through Friday.

Custom Guitars - Custom built Martin instruments may not be ordered directly from our Custom Shop. We ask that you please contact your authorized Martin dealer to get a quote on a custom built Martin. An authorized Martin dealer can assist you with appointment, pricing and delivery requests.

Choosing your Martin - Your dealer is a great resource to help you choose your new Martin. Approximately 1000 dealers throughout the United States and Canada are strategically located to provide you with Martin product and service. To find your nearest authorized Martin dealer in the United States or Canada click (here). For international customers please click (here) to find the distributor for your country.

Used guitar inquiries - C.F. Martin's position is not an intermediary between a purchaser and seller to validate or discredit a seller's or purchaser's claim about an instrument. We suggest you contact an independent consultant to verify any used Martin product for sale.

C. F. Martin & Co., Inc.
510 Sycamore Street
P. O. Box 329
Nazareth, Pennsylvania 18064-0329

Phone: 610-759-2837

Phone: 888-433-9177

Fax: 610-759-8742

E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Hours: Monday - Friday 8:00 AM - 5:00 PM (ET)

Holiday/Shutdown Schedule

Understanding the Martin Line

The initial letter(s) usually stand for the body size/type. 
D = Dreadnought
J = Jumbo
M or 0000 = Grand Auditorium
000 = Auditorium
OM = Orchestra
00 = 00
B = Acoustic Bass
5 = Size 5 Terz

Other style options include:
C = Cutaway
12 = Twelve-string
H = Herringbone
HP = Herringbone pearl
V = Vintage
Note: Hyphen (-) separates size prefix from style prefix.

The number after the letter designates the ornamentation or series styling. 
The higher that number, the fancier the guitar.
Ornamentation styles of our Standard & Vintage Series models:
Other styles run:

Special Features
The letter after the number denotes a special feature.
S = 12-fret neck to body juncture
GT = Gloss top
N = Nylon strings (Classical)
E = Electronics

Other special features:
A = Thin body
DB = Deep body
LS = Large soundhole 

Additional Information on Size/Types



Your guitar is made of thin wood which is easily affected by temperature and humidity. This combination is the most important single part of your guitar’s surroundings. Martin keeps the factory at a constant 45-55 percent humidity and 72-77 degrees Fahrenheit. If either humidity or temperature get far away from these factory conditions, your guitar is in danger. A rapid change in temperature or exposure to cold can cause small cracks in the finish. These are lacquer checks. We recommend the use of a hygrometer/ thermometer to measure the relative humidity and temperature surrounding your guitar.

As humidity increases, moisture content of wood goes up rapidly, causing it to expand and swell. A gradual increase in humidity won’t generally do permanent damage to your instrument. When very high humidity is combined with high temperature, glue joints could possibly become weakened and may even open slightly. If your guitar is exposed to high temperature or humidity for any length of time, the glue under the bridge could weaken causing the bridge to pull off.

Rapid changes in local humidity are what you want to guard against. If, for instance, you place your guitar near a source of dry heat, the humidity around it will drop much faster than it would naturally, although a sudden dry spell can have the same effect. If the moisture content of wood is forced down in a hurry, portions of it shrink faster than others, causing cracks and open joints. Don’t set your instrument next to a source of heat or hang it on a wall where it will dry out. At all costs, avoid hanging your guitar on an outside wall during winter months. The wall will be cooler than the inside air. The result is a conflict between the temperature of the top and back, with potential damage as a result.

Should the guitar be exposed to freezing temperatures, let it warm to room temperature while still in its case. This lets it come up to room temperature more slowly, decreasing the possibility of wood and finish cracks.

Caution should be taken if you choose to use a humidifier to combat low humidity. Moisture in direct contact with the guitar could cause damage, as can the rubber or vinyl parts of a humidifier.

We recommend storing your guitar in its case when not in use. Humidity is easier to control in a smaller space. Don’t bother loosening the strings when putting your guitar away unless it won’t be used again for several months. Constantly tightening and loosening strings quickly ruins their sound.

The Martin hard case supports the neck and body of your guitar as evenly as possible. It’s important that you don’t let anything lie under the head (the tuning machine end), as this could damage the neck and body.

Repair work can be performed at authorized warranty service centers located throughout the United States and Canada.

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