I'm sorry to hear that mate. As a matter of fact, it's very hard to find a Seamaster rep bond style that comes with AR coated crystal these days. Genuine crystal replacement may be too expensive for a Seamaster rep. No matter what, it's still a nice rep. Wear it proudly!
Yeah... get the 4th gen. It's definitely a replica worth keeping. Modding options are available to get it done with genuine black dial, genuine hands and a genuine rubber band.