No worries on the mix-up. Easily done.
Yes, I think the actual item your friend found is the cap and broken shoulders from a metal tube of the kind used to hold ointments and lotions. There looks to be a seam separating the two parts, so I would guess the cap pulls off or unscrews.
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The lettering style of the monogram looks to be late 19th or early 20th Century and I read it as UDCo. Although never registered as a trademark in the US, I think it is for the United Drug Company, founded in Boston in 1902 and sold to Walgreens in 1943.
The company made all manner of pharmaceuticals, including ointments in squeezable tubes, selling through ‘Rexall’ stores throughout the US and often under the ‘Puretest’ brand. They later had a Canadian arm based in Toronto.
Here’s one of their Canadian ‘Eudicaine’ ointment tubes. It’s a later product with a non-metal cap but I think that’s essentially the same monogram on it. Frustratingly, the cap isn’t shown in plan-view.
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