I don’t own the 5610U yet, but I definitely do agree with you that it’s the closest to the original 5000C from 1983. I wish that Casio could bring back the original 5000C. I would buy up a few to have and wear.I’ve been really loving my new 5610U. So much in fact that that’s all I’ve worn since it came in almost a week ago now haha
I love the fact that it shows the time in all the modes. That was the one major drawback of my GW5000 and GW6900. No time in the upper right corner while in other modes. I use my stopwatch and timer very often and it’s a PITA switching back and forth to know the time.
Also, this new 5610U is super accurate. When I got it it hasn’t synced with the atomic clock in almost a week. It was .5 seconds off from the actual time. That’s 1/2 a second gain in a week. 2 seconds a month !!! Since I’ve been wearing it, it has synced every night to the atomic clock, and I live in AZ, and it’s synced every night without fail.
This is one amazing watch that to be honest definitely didn’t really need since I have like 5 other squares already ( DW5600E, DW5600C, GW5000, and a 5000-B metal/rubber model ) but super glad I did. It looks the closest to the original 5000C from 1983 IMO.
Another thing I like is the alarms / hourly signal is just a tad louder than the GW5000 and 5000-B as well. It actually wakes me up every morning.