The Space Center Houston NASA silver plated coin is a limited edition of only 5,000 and features the official Space Center Houston logo on the obverse (front) with the reverse (back) of the coin showcasing the NASA Worm logo. Each coin measures 39mm in diameter and each coin is individually numbered on its edge. A certificate of authenticity accompanies each coin delivered in a protective capsule and a custom jewelry case. Proudly made in the USA by The Highland Mint.