Gibson Custom Shop (CS) has its own serial formats that diverge from Gibson USA. The CS label launched in 1993 and has produced a steady stream of Historic Reissue Les Pauls, Murphy Lab aged models, artist signature runs, and short-run collectibles. Each of these uses a distinct serial scheme.
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CSLB followed by a single run-letter and an optional sequential. Tom Murphy hand-aged instruments — letters in the body, no production year encoded in the serial. The build year comes from the listing context (or from the inscribed Murphy Lab certificate).
The first post-CS digit encodes the year within its decade (1 could mean 1991, 2001, 2011, or 2021). The closest valid year ≥ 1993 is chosen using the listing year as context.
A 6-digit variant where the first two digits are the 2-digit year and the remaining four are the sequential rank.
Pure 5- or 6-digit sequential numbers on Historic Reissue / R-series / Murphy Lab Les Pauls. Format is MYRRR(R) where M is the model-year digit (0 = R0/1960, 4 = R4/1954, 7 = R7/1957, 8 = R8/1958, 9 = R9/1959) and Y is the last digit of the build year. When M matches a documented R-series model digit the decoder snaps Y to the closest CS production decade using the listing year (Custom Shop launched 1993). When M is not an R-series digit we match the format but leave year null (other CS historic lines use different first-digit conventions). Requires a listing year and a model hint (Reissue, R0/R4/R7/R8/R9, Historic, Murphy Lab, or Custom Shop) to claim.
CC followed by the series number, the letter A, and the unit rank within the series (e.g. CC34A103 = Collector's Choice #34, unit 103).
Each signature or limited run issues its own letter prefix followed by a sequential rank. Recognized prefixes include JP/JPP (Jimmy Page), AFD (Appetite For Destruction), ACE (Ace Frehley), ANACONDA (Slash), JCW (Jerry Cantrell Wylde), JOEB (Joe Bonamassa), PT (Pete Townshend), RG (Robot Guitar), SL / SLASH58V (Slash), and others.
A followed by 8 or 9, then 4–5 digits. The 8 or 9 identifies the reissue model year (A8 = '58, A9 = '59); the following digits are year + rank, but the label does not reliably encode current production year.
Custom Shop serials are usually impressed on the back of the headstock. Some Historic models also carry an additional interior label or a truss-rod-cavity stamp. Collector's Choice and artist-run models typically have a separate COA with the full provenance.
Back of headstock
The primary location for CS-prefix, Historic Reissue, and artist-run models. Usually impressed through the finish.
Control-cavity / truss-rod area
Historic Reissues often have a secondary stamp or label inside the control cavity that matches the headstock serial.
Certificate of Authenticity (COA)
Artist runs, Collector's Choice, and Murphy Lab instruments ship with a COA noting the serial, build date, and (for artist runs) unit number within the run.
Official Gibson lookup tool; covers Custom Shop alongside USA formats.
Dealer reference documenting the CSYXXXX format (CS + single year digit + sequential rank) and its decade-ambiguity caveat.
Community thread documenting the ambiguous 6-digit CS variants (CSYRRRRR single-Y vs CSYYRRRR double-Y).
Every format rule on this page traces back to at least one of the sources above. If you spot an error or have an additional authoritative source, see the methodology.