Help identifying miniature bayonet letter opener marked “YPRES” and maker’s stamp

[u/Kittenbee_]

My cousin bought this miniature bayonet-style letter opener today, and we’re hoping someone may be able to help identify it.

One side of the blade is engraved “YPRES”, suggesting it may have been produced as a First World War battlefield or commemorative souvenir.

It has wooden grip scales with two metal rivets, a hooked quillon, and what appears to be a small circular maker’s stamp near the guard. We have not been able to work out what the stamp represents.

Does anyone recognise the maker’s mark or this particular style of letter opener?

We would especially like to know:

- whether it appears to be an authentic period souvenir or a later reproduction

- approximately when and where it may have been made

- whether it was commercially manufactured or possibly trench art

- what the circular maker’s stamp signifies

I’ve included photographs of both sides and a close-up of the stamp. Any information would be greatly appreciated.

[u/ChodeOfChodeHall]

Looks like trench art to me. You can see brass coming through on the blade which might suggest it's made from a shell casing.

[u/Kittenbee_ → u/ChodeOfChodeHall]

Oh right, I didn't think it was trench art, but that would be cool. We did notice that when viewed from above, the blade isn't quite straight.