Wear it in good health. I like the blue strap a lot, it makes a different, fresh look. Unfortunately, my 2526 gets nearly no wristtime, so I was already thinking about to sell it. But may be I should try a non-black strap as well...

Of course there are many beautiful Calatravas but the 2526 is for me THE Queen of all
.
As you said you only have to find the right crown but more important is to have a case and a movement in very good condition, and a dial in perfect condition. It seems yours ticks all these major cases and the crown only will only take some time but not impossible to find.
Your dial seems to be first generation if I don't mistake (the most sought after yummy yummy) which makes it even better in such perfect condition.
Hereafter the link to post I made few years back about my former one (gone but not forgotten) www.watchprosite.com
Big congrats on yours which is a beauty, and don't worry your Queen will find her proper crown
Best,
Mike