Cannot Figure Out What This Is! Important To Find Out Asap! Thanks!

Much larger and brighter pics of the coin needed. These of little use.

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It would be impossible to determine the nature of the powder from a photo, and the coin/medal item is too indistinct.

As for the nature of the powder, it is likely not a military poison such as might be given to a spy ("take this if you're captured"). Such a poison would be in pill form, so it could be taken easily. A powder would be too difficult to self-administer in secret, and too easy to under-dose (so you only got sick, instead of dead).

That's not to say that the substance is not toxic. Back then, people used all kinds of things in everyday use, that are banned today because we know they cause either chronic or acute health problems. Plus, a harmless substance might have degraded into something more toxic over time. Anything powdered, when deliberately inhaled, will likely cause lung irritation and make you feel unwell. If symptoms persist, take the coin with you to the doctor; tests can be done to try to determine the cause.

As for the long-term identity of the object, I'd suggest taking it to a museum or military historian.

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Your post was moved to the appropriate forum for the proper attention.