To look up a serial number, you must primarily rely on direct verification with the manufacturer, as SIG Sauer does not provide a public, searchable database for individual firearm production dates. The Mosquito was manufactured by German Sport Guns (GSG) and sold under the SIG Sauer brand until it was discontinued in 2013 and rebranded as the GSG Firefly . Official Lookup Methods
affects Sig Mosquito pistols with serial numbers between M-06500 and M-14500 manufactured before May 2012. Not all numbers in that range are affected—only specific batches.
Located on the right side of the slide or barrel hood, look for a stag antler (proof house of Ulm) followed by a two-letter code: Sig mosquito serial number lookup
The Sig Sauer community has built crowd-sourced databases. Try these resources:
In conclusion, performing a serial number lookup for a SIG Mosquito is an essential step for owners to verify the authenticity and history of their firearm. By understanding the importance of serial number lookup and how to perform one, SIG Mosquito owners can ensure that their firearm is genuine, compliant with regulations, and accurately represented in terms of its history and value. Whether you are a seasoned firearms enthusiast or a new owner, taking the time to perform a serial number lookup can provide you with valuable insights into your SIG Mosquito and help you to appreciate its value and significance. To look up a serial number, you must
Within each series, higher numbers indicate a newer production date. How to Find Your Manufacturing Date
| Variant | Serial Number Clue | Value Premium | |---------|--------------------|----------------| | | M-02XXX – M-03XXX (mixed) | +$50 | | OD Green Frame | M-1120X – M-1127X (consecutive block) | +$75–100 | | Tactical (Threaded Barrel) | M-14XXX – M-15XXX (plus “T” suffix on box) | +$100–150 | | Navy (Coyote Tan slide) | M-07XXX – M-08XXX (rare) | +$200 | | Two-Tone (Silver slide/Black frame) | M-001XX – M-007XX (early only) | +$50 | Not all numbers in that range are affected—only
Because the Mosquito was often manufactured or assembled in Germany, you may find on the slide (typically on the underside near the muzzle). These letters correspond to specific years: A = 0 | B = 1 | C = 2 | D = 3 | E = 4
SIG Sauer Mosquito is a unique piece of SIG's history, often sought after as a dedicated .22 LR rimfire trainer that mimics the ergonomics of the classic P226. Because it was subcontracted to German Sport Guns (GSG)
If you buy a used Mosquito with a serial in that range, always assume it might be unrepaired until you check.