Need more info in order to help. From your question it is S/N 11848 but the barrel markings are needed to determine what model you have.
Your question is basically not answerable. Since it began making firearms over 150 years ago, Colt has made hundreds of thousands of products. Colt also made items which have no relation to firearms and had serial numbers. If you provide a detailed description of all markings, caliber/gauge, barrel length, handgun or longgun, etc.. an answer might be possible
updated answer: MAB was a major French pistol manufacturer from the early 1920s until the early 1980s. During that time it made a number of pistol models, including the model A vestpocket pistol (.25 caliber); B vestpocket pistol (.25 caliber); C pocket pistol (.32 and .380 caliber); D service pistol (.32 and .380 caliber); C/D service pistol (.32 and .380 caliber); E pocket pistol (.25 caliber); F target pistol (.22 short and .22LR caliber); G pocket pistol (.22LR caliber); GZ pocket pistol (.22LR caliber), also made as "MAB Espanola" by Spanish gunmaker Echasa in .22LR, .25, .32 and .380 caliber); R-22 target pistol (.22 short for the "Olympic" model, and .22LR, sold in US as "Le Chasseur"; R service pistol (.32 and .380 caliber); R service pistol (9mm parabellum) - each of these "R" models is significantly different from the others; P-8 service pistol (9mm parabellum), P-15 service pistol (9mm parabellum), and PAP-F1 target pistol (9mm parabellum -- a heavily modified version of the P-15 made for competitive target shooting; the French Army Pistol Team won a number of awards using this).When the Germans army occupied France during WWII it took over the MAB factory and kept the .32 model D in production for German military use. These occupation pistols will have German army acceptance stamps. They also produced a small number of the model A for use by German military personnel. The French military used the .32 model D during WWII, and after WWII in the French colonial wars in IndoChina (Vietnam, etc) and North Africa (Algeria, etc) until about 1950. The P-15 was used by a number of military forces in the 1960s and later, especially because of its 15-round capacity and accuracy.The range of prices I have seen for MAB pistols in the US since 2010 is from about $50 to about $1300; pricing is similar in Europe, although in many cases different models go for higher prices in one or the other (the P-15, for example, is more sought after in Europe than in the US).Value of these pistols depends greatly on which model it is, which version of the model it is, special markings on the pistol, and the condition of the pistol. Pistols with WWII German army acceptance stamps are usually worth more. Some of these pistols, such as the models A and D, were in production for over 50 years, with a number of design changes over the years.original answer: 10-200 USD or so
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