Sigma Guitars roundup
Sigma Guitars: A Complete Buyer's Guide
Vintage or current, Sigma Guitars reward a bit of homework before you buy. Here's exactly what to check.
Right, let's get into the actual detail, because buying Sigma Guitars isn't quite as simple as buying most acoustic brands — this one comes with real history attached, which means real homework attached too. Whether you're eyeing a vintage example or a current model, here's everything worth checking before you hand over any money.
First Question: Vintage or Current?
These are genuinely different purchases. A vintage Sigma dates from the original Martin-owned era (1970 to the American discontinuation around 2007), while a current Sigma comes from AMI Musical Instruments GmbH, which bought the naming rights in 2011 and relaunched production. Neither is automatically the better choice — it depends entirely on how much inspection and risk you're comfortable taking on.
Buying Vintage: What to Actually Inspect
- Neck angle — a bridge saddle with very little height remaining can signal a neck reset is coming
- Top deformation — some belly behind the bridge is normal; excessive bulging or sinking isn't
- Bridge adhesion — check carefully for lifting at the wings and rear edge
- Bracing — listen for rattles, and check for loose braces where you can
- Fretboard and frets — look for uneven wear and unusually high action
- Headstock and tuners — watch for repairs, cracks or non-original replacement machines
- Label and serial number — photograph both; factory and serial systems weren't consistent across all production periods
A structurally sound vintage Sigma with a good setup can be a genuinely lovely instrument. One with serious neck or bracing issues can cost more to repair than it's worth — there's not much middle ground, so inspect properly or bring someone who can.
Buying Current: A Different Checklist
- Confirm authorised dealer status and your warranty territory
- Check whether the top — and ideally back and sides — is solid or laminated
- Ask about the factory setup quality before you commit
- If it's an acoustic-electric, check the pickup brand and system fitted
- Confirm whether a case or gig bag is included
AMI states its current range uses solid tops with bone nut and saddle as standard, which is a genuinely solid baseline spec for the price bracket. Still, always confirm the exact wood species, bracing pattern and neck dimensions for the specific model you're looking at, since these vary across the catalogue. Our value comparison across current models is worth reading before you settle on one.
Choosing a Body Shape for What You Actually Play
| You mainly play | Consider |
|---|---|
| Strumming, bluegrass, flatpicking | A dreadnought for projection and bass |
| Fingerstyle, recording, all-round comfort | A 000/OM-style body |
| Blues, folk, intimate playing | A parlour or small-body model |
| Classical, Latin styles | One of the nylon-string models |
Don't Assume the Model Name Tells You Everything
A Sigma with a Martin-style model number isn't automatically equivalent in materials, bracing, finish or resale value to an actual Martin carrying a similar-looking designation, and "Sigma Guitar" alone can refer to three genuinely different production eras. Do the specification homework rather than assuming from the name. Our full history guide explains exactly why the naming gets confusing.
Our Advice on Buying Sigma Guitars
Decide vintage-versus-current first, inspect thoroughly rather than trusting a listing at face value, and match the body shape to how you actually play rather than what looks most impressive on a wall. Get those basics right and Sigma Guitars make for a genuinely solid acoustic purchase at a fair price. Brand new to acoustics generally? Start with our beginner's guide instead.
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