I,m not an expert, but the only trials 1913 bayonets for the pattern 1913 rifle I know of were made by Vickers and only small numbers 1000-1500 made ? only ever seen one (in the flesh) and was a few years back. Old Smithy is the one to contact in the Edged weapons forum.
Added info Just searched pattern 1913 bayonet on google, and this came up from the IWM see link
sword bayonet for Enfield .276 experimental rifle Pattern 1913 [.276 experimental] | Imperial War Museums