You are right on the confusion on Euro and British Pounds...
Don't think there is as much confusion on currency values as there is a dynamic volatility in the markets--all of them.
Over the past year, the value of a USD $ has climbed against both the Euro, and the Pound.
Over the past year, the value of a Euro has climbed against the Pound, though more so in the past 6 months.
Over the past year, the selling prices in the USA of Pagodas--"The Market"--has been climbing, placing the same car at a higher value today, than last year.
So, cars are listed here at one price, and they sell at another. The auctions are a good of indicating where prices are going, since they are purely discretionary purchases and public information. The sources for prices in the USA, as mere guides, are based upon reported sales. All indicate a stiff rise.
Some of the photos that people post of cars for sale, particularly ones that appear to be on the lower end, are a bit misleading. Take a look under the hood, and the undercarriage, and in the boot/trunk. There are a lot of cars that look pretty on the outside but are really tarted up...and need a bit of work where you can't see it from a pretty profile.
A "mint W113" is going to cost--and with the dollar being what it is, probably more here than in Europe. However there was a time when the opposite was true. Many Pagodas were getting shipped back to Europe with a low dollar.
Good luck in your quest.
This conversation/thread reminds me a bit of one we had here a few years ago when a buyer was aghast at the price of a new Grill Star/Barrel Assembly ($1,200+) from Mercedes-Benz, and equally annoyed that either NOS, or good used ones either privately, from broker dealers or eBay were over $600, some more than that. Seemed he wanted a nice one for less than the market was bearing...and during the conversation my guess is the market went up.
This same conversation was held years earlier when the same part was half the price...