A bit painful to offer this contribution but I had a Blue Max and sold it because I thought it was too small. Later I bought a Hammerhead and loved it... until I thought it was too big! ... and then
sold IT! Similar to the Blue Wave. The Max was 40mm, the Hammerhead was 45.5mm (diameter). Both the Max and Hammerhead had blued movements but the Max was a 300m watch and the Hammerhead was a
200m watch. Now, I'm preferring smaller and dearly mis the Max... but wouldn't mind still having the Hammerhead! I think a good rule is any UN from the late 90s to early 2000s should not be sold!
I also sold an Annual Calendar and a Dual Time from this period and eventually hunted them down and repurchased them. Hard to find, paid more, didn't care. Just keep 'em!