Ah, another 63 thread, excellent!
If someone wants a 23 or 63, at least there's an option, right?
For the 63, nothing compares to an EL, of course...but one thing EL didn't have was the correct sized cyclops, 5.5mm not 6mm. A few people, including myself have purchased DSN's 27/28 6mm crystal with no AR, but the damn cyclops isn't centered over the datewheel perfectly, so if you have OCD, gonna drive you nuts...so I'm tempted to buy this crystal to try it (strip the AR if alignment & mag is correct)