That's an interesting card.
What's good is that it's also probably missing another color. Many missing colors that are real are missing a second color as well.
But there it becomes a puzzle. What other color is missing?
I'd say light blue, because all the ones I see have light blue under the uniform, darkening it and making it dark gray with light blue buttons.
But here it looks like it has light blue under the collar. And the typical dark blue is way too dark to be either.
What's the back?
Another interesting thing that would stand some looking into, is that from just a quick look, there are two different types of this card. The one shown, and the one shown here.
https://t206society.com/product/fred...ont-150-sgc-2/
Put the images side by side and see how many differences you can spot. It's fun.