I think it's fair to say the sales pitch is creative!

[Buccaneer]

An interesting one this, I contacted the seller to point out that that the item was in fact from a Swedish Mauser and not the one used for the L42 CES.
He came back to me saying that as an ex army SNCO that these were in fact issued with the L42 when the supply of the single bottle ran out.
I have never seen any specification for the CES which describes anything other than the single bottle so if the double bottle was being used does this mean that it was official and that for a good while now people have been paying hundreds of pounds for the plastic bottle when they could have picked up one of these twin bottles for just a few quid???