Sadly to the normal man on the street Seiko are just a cheap watch brand and their values your colleagues guesstimates on price/value would be the norm.
For me this is a real plus as the amount of people that give disparaging looks at my Rolex and ask the inevitable question “is it real” really get my goat.
To wear a watch of such high quality and draw no attention suits me just fine, if on the rare occasion somebody recognises the watch for what it is, rest assured that a decent watch conversation will follow.