Your location information should reflect where you are shipping from.
Buyers should never be surprised by border slowdowns, or worse by having duty and sales tax demanded on the doorstep when they thought the product was in their own country.
And you will find it easier to list on the appropriate site depending on your location. DotCOM or DotCA, which makes for accurate shipping information.
Would I be right in thinking that you carry your vintage jewellry with you when you cross the border?