Thank you very much Ingvar, for checking those references and for the detail on this. It did seem like this might be of the type issued to artillery units and other ersatz units in WWI. I understood what you meant by special issue, which these ersatz units would have been as they were replacement units and equipment would have been special ordered.
All best regards,
Jim
P.S. I'd still love to discover how the Bezdek reference arrived at the M1813 hussar sabre designator for this.