1907 Bayonet Unit Identification Help

All,
I recently picked up a British 1907 bayonet that is marked “Dep B.W. 13” on the pommel, I’ll post pics later.
Can anyone identify the unit?

Here are the pics. Any help identifying the manufacturer would be appreciated too.

Regimental Depot, Black Watch....... Somewhere in Scotland!

Thanks for the reply. Very interesting that it made
It to the US!

I think that Brian at BDL Ltd has a small booklet copied from the 1942 Equipment Regulations that lists all of the abbreviations .

Thanks, I will check with him.
FYI, I have the Broad Arrow Mk.2 book by Skennerton and I did not see it listed there.