You are looking at an 8" x 4.5" Marvel Comics Retail Store Display Promo Card by Ron Lim & Terry Austin from 1995.

It is a 2-sided card with identical artwork on both sides. 1 side has an adhesive strip.

I have 8 of these postcard size promos.
 
It has never been used and has been stored flat in mylar since 1995. 

This card will be securely bagged, boarded and sandwiched between 2 pieces of cardboard to ensure that it arrives safely to you.

Combine shipping on up to 3 items for no extra charge and .50 cents for each additional item shipped at the same time.

Shipping in Canada will be with Tracking. 

Tracking to the USA and International destinations is available upon request, otherwise, it will ship via First Class Mail. 
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Cheers.