Congratulations! My Speedmaster was the first high end Omega I ever purchased. Still one of my favorite watches! Since you have impeccable taste, may I suggest spending a little more and obtaining a genuine Omega Nato strap. They are ridiculously expensive and perhaps, at least to some, a rip off. However, I think they are worth every cent. I almost exclusively were mine on one of my many genuine Omega Nato straps. Just a suggestion/recommendation.
Get ready to enjoy a lifetime of appreciation for your Speedy. I smile every time I wind mine.