Some for the canadians
 

1. button, New Brunswick Engineers.
2. button, 1st Royal Scots, US made.
3. S/T, 1 / DAP / CANADA, ? ammunition park.
4. Bond purchase pin 1917.
5. armlet, not sure of age or purpose.
6. not strictly Canadian (ww1) miss struck Newfoundland cap / collar, missing 1 lug, bought (swapped for beer) Trapper Johns 1985, this is up for swap for cef collar, wants list available on request

NB Engineers, scarce button. I can't find a definite ref to the 1st Royal Scots. The 5th Regiment was organized on a two battalion basis in 1906, and there may have been a button for the battalions.
The 1 DAP Canada is the title for 1 Divisional Ammunition Park.
No idea on the CANADA armlet.

Hi Bill, Chris Brooker confirmed it being a Canadian button, maker is The Knowles Ringer Tailoring Co, Chicago, if needed will post a photo of the reverse tomorrow. (its too dark now, uk)

An image of the reverse is welcome. Chris may have indicated that it is, but I can't find the designation to suit in any of the history of the Black Watch.

reverse of 1st royal scots button
 

Knowles Ringer tailoring Co

Thanks. Still digging for a reference to the designation used on the button.