Value retention is based on hype, perceived scarcity and demand. These things will change over time. It's just something we keep telling ourselves to justify a purchase. There are no guarantees.
People don't understand, watches have depreciation, it's not a commodity like gold that has tons of uses and is finite (by the way, price of gold also tanks), nor it's a unique item like a rare piece of art or a faberge egg. There is no basis to claim a piece of steel with some applied indices is similar at the end of the day.
If you can't take a risk that the price of a watch will decrease and it will be worthless in a few years you shouldn't buy it.
Also, if a purchase is a meaningful part of your savings you shouldn't buy it either. Just be real with yourself with what you can afford or willing to gamble away.
My advice as a financier, take the money and if its disposable within reason, invest it into low return financial instruments as interest rates have hiked. If you want to gamble it away, a poker table would be my preferred route.
Best of luck with your decision!