? ww2 RN Commando ? with dagger on collar

[Lemataf]

Hello,

Yesterday, two online auctions from same seller came to their end.
One was for a nice sailor portrait (dated June 1944) in battle dress, with RN + Commando shoulder title, RN pork pie cap. This auction ended up quite high & I missed it.
The other one showing another sailor in BD, undated, with soulder title poorly visible finished at a far more reasonnable price, and is now on its way home.

My guess is that both pics were probably the property of the same man, and could both show RN Commando men, including possibly too from wartime period for the one attached here I managed to get.

What steers me to the assumption of a possible RN Commando, beyond their same seller source, is the presence of what seems to be a reduction of metal dagger on the collar of the sailor (never seen this practice before, guessing individual initiative?) and the possible ending «*DO*» that one can hardly be sure of, on the shoulder title.

I’d be interested to get your opinions & comments on all this.

Cheers,

JD