I suppose much of the 5513 appeal comes from the acrylic crystal - understandably so. A competent watch technician can convert most watches from mineral or sapphire to an acrylic crystal. In the past I had a vintage Junghans and a vintage Seiko converted to acrylic crystals with very good results. Just something to keep in mind if there are certain watches that you find attractive that don't come with an acrylic crystal.
There's also an interesting thread regarding the topic of acrylic conversions: https://forum.tz-uk.com/showthread.p...crylic-Crystal