Research before you respond
Before contacting any seller, establish the fair market value for the specific guitar you are considering — not the model in general, but that exact model, year, and configuration. The only reliable source for this is completed sales, not asking prices. On both Reverb and eBay, you can filter to show only sold listings. This shows you what buyers actually paid, not what sellers hope to receive.
A price significantly below market is your first and most important red flag. Counterfeits, instruments with undisclosed damage, and stolen goods all tend to be priced below market because the seller either cannot or will not justify the full price. A genuine, properly described instrument will be priced within normal range for its condition.
Get the serial number before you get interested
Request the serial number as one of your first questions, before expressing strong interest. Run it through a decoder to confirm it is consistent with the claimed brand, model, and year. If the seller is reluctant to provide a serial number, or if the serial decodes inconsistently with what is being claimed, treat this as a significant warning sign.
Ask for a photograph of the serial number in its physical location on the guitar — not just the number written in a message. A photograph confirms the format and condition of the stamp or impression, and makes it harder for a seller to give you a serial from a different instrument.
Request specific photographs
Do not accept only the photographs the seller chose to provide. Request close-up photographs of: the back of the headstock with the serial number clearly visible; the headstock front showing the full logo; the neck joint from the back; the control cavity interior (for electric guitars); any areas of wear, repair, or modification; and the full length of the neck.
On acoustic guitars, ask for a photograph of the interior label through the sound hole, and any visible bracing if possible. On vintage acoustics, interior construction details are important for authentication. A seller who refuses specific photograph requests on a valuable instrument is a seller to avoid.
Ask the right questions
Ask explicitly: Has the guitar had any repairs, modifications, or refrets? Has the finish been touched up, partially refinished, or fully refinished? Are the tuning machines, pickups, bridge, or nut original? Is the guitar selling with its original case, and if so, is the case original to the guitar?
These questions matter because they affect value. A refinished vintage guitar can be worth a fraction of the price of the same guitar in original finish. Replaced components can reduce vintage value significantly. A seller who knows their instrument well will answer these questions without hesitation; a seller who deflects or becomes defensive may be concealing relevant information.
Understand platform buyer protections
Reverb has the strongest buyer protection for musical instruments of any major platform and is generally the preferred marketplace for guitars. Their purchase protection covers items that are significantly not as described, including fakes and instruments with undisclosed damage. eBay's buyer protection is also robust for significant misrepresentations.
Pay with a credit card or PayPal whenever possible, as both offer chargeback protection if an item is materially misrepresented. Avoid bank transfers, Zelle, Venmo (for goods), or cash for instruments you have not yet received and inspected. Once money moves via these methods, it rarely comes back.
For significant purchases: get an inspection
For any guitar worth more than a few hundred dollars, offer to arrange an inspection by a qualified guitar technician or luthier before finalising the purchase. Many legitimate sellers, especially those selling locally or willing to ship to a nearby shop, will accommodate this. An independent technician can identify hidden cracks, repairs, neck resets, and construction issues that do not appear in photographs.
For very high-value vintage instruments, consider engaging a specialist appraiser rather than a general guitar technician. Luthiers who specialise in a specific brand or era will have knowledge that generalists lack. The cost of an appraisal is always worth it on an instrument worth thousands of dollars.
Set a return policy expectation upfront
Before purchasing, confirm the seller's return policy. Any reputable seller of a legitimately described instrument will offer at least a short return window — typically 3-7 days for you to inspect the guitar on arrival. A seller who refuses any returns under any circumstances is a seller to approach with considerable caution.
When the guitar arrives, inspect it promptly and thoroughly against the description. Check the serial number matches what you were given. Play it. Check the neck, frets, electronics, and hardware. If anything is significantly different from what was described, initiate the return process immediately — do not delay and do not modify the instrument before returning it.