Mystery Bayonet

[Flying10uk]

I have owned this mystery bayonet for a long time but have never managed to positively identified exactly what it is intended to fit. I thought that it may have been a Mauser variation bayonet but it doesn't appear to be the standard Mauser fitting because the bar slot is too short, see picture, please. I did also wonder if it could be intended to fit a Axis SMG of WW2 (Austrian?) but this is little more than speculation on my part. There is some very feint markings on the blade but I can't fully make this out. The last 2 letters of the first word look like ****ON & Co. There looks like that there could be a "S" as the first or second letter of the first word.
Thanks for any help in identifying this bayonet.

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