According to the serial # you furnished 11254, it would appear to be mfr. in 1957 and is a 20 gauge Superposed. Serialzation for that year began at 10501 and ended at 11500. This would put your gun at the end of production for that year. Value of this gun depends much on condition and grade (standard, grade I or II,III,IV,V or VI. You need to have a reputable dealer appraise this gun for you. I say this as there are people out there who will take advantage of you. This gun may fetch you anywhere from $900 to quite a few thousand depending on the grade and condition. Obtain pictures of your gun and go to this web address where you will get ample assistance. ShotgunWorld.com use the gun ID and value forum to get an answer to your gun value and grade.
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Check the auction sites. To many variables that you don't address, like gauge/caliber, overall condition, accessories, box, manual, number of rounds fired, etc..
The 'Z' indicates that the gun is a "Light 20" model. Values of these Belgian A5's have skyrocketed with mint condition guns over $1000. Shooters will bring somewhat less. sales@countrygunsmith.net
In the order of £350, depending on condition.
There isn't one
The book only shows 12 and 20 gauge.