I got nothing better - it has the '23' and the Netherlands crown/'N' and the harmonised trigger - I bow out
you got us - have another one P.S. you'd probably like this site; http://www.landofborchardt.com/swiss_acc.html
It has the look of a Steyr but I can't find the model right now - the one I'm thinking of was I think called the 'Spiegel'?