I guess it is because the Swiss franc went up by 30% against the £ and about 20% against the $ over the last 2 years.
By the way I finally bought the 5127 in yellow gold instead of the 5053 or the FP Journe octa. Having had the watch on my wrist over the last 2 weeks, I can't understand why I was hesitating.
I am so glad I chose it. Thanks to all of you who gave me their opinions about these 3 watches.