12mm Pinfire Alarm Pistol

Is this an alarm or booby-trap pistol? 12mm Pinfire with no maker name.
No 52 , 70mm octagonal smooth-bore barrel. 141mm length overall.
The chamber is 20mm long. Two holes to mount the pistol somewhere like a drawer or a doorway? Quite unusual but looks like a cheap Belgian made Pinfire.
Any comments appreciated on a possible use.

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I think any of these could be used as an alarm or boobytrap.

I actually have a book on these somewhere. I’ll see if I can find it sometime. I think it’s packed in a box somewhere.

http://s144812367.onlinehome.fr/canon-avertisseur-a-broche

an other boobytrap …