Great little piece of history to own. The one small gripe would definitely be the minuscule dirt or dust specs found inside the cube as you can see in the photo. I know Engineered labs do things by hand so stuff can happen. Not a big deal since they’re very small but it’s definitely noticeable. Also, it would have been cool to receive a paper authenticating the piece inside. The SR71 foundation has a list of blackbirds including this one, but I think for future purchases in this category I’d appreciate the comfort of handing down a piece like this to the next generation with some form authenticity. Overall, I’ll most definitely purchase more items from the brothers at engineered labs. They clearly love what they do.