First and early models came with the ever so common bubbled plastic crystal, and later models changed to the sapphire crystal. Today, there are options to convert these from plastic to sapphire, but for the true collector, most remain plastic.
Again, what you are seeing here, is a well taken care of watch, not serviced for over a decade, but ready for a full restoration. This conservative model is, as I’ve said, one of the most popular models, and I see many of these each month.
Because they are still popular, they hold their value very well. Even today, getting a good condition, unrestored watch like this may cost a bit, but once serviced and restored will last a very long time, and hold its value far better them flashy, more complicated or exotic models.