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I only did a quick search (UK, US), there could be community (EC) registered marks that are earlier but these should have shown up (in the UK search).

Trademarks are unregistered IP as well as registered. Registration gains you more protection and makes suing people easier but it can be done with an unregistered mark (or that's how things work in the EC).

It doesn't matter when any product was made in as much as the registered mark is a sign of the origin of goods/services it is not a product mark. If there is no other IP protection on your product I can rip it off and sell it as long as I don't use your trademark.

I don't know sufficient to comment on priority of registrations in the US both in the specifics and in general, sorry.