The original sales statistics show that roughly half of the total production of the W113 was exported to the US. Many cars were subsequently exported from Europe (and other places probably) to the US. However I would guess that, on balance, the migration pattern is a net re-import from the US to Europe, by maybe a couple thousand cars.
I spoke recently with a major restorer of 300 SL's, Pagodas and 190 SL's, and their rough average of a total restoration is around Euro 90,000 ...
Cees Klumper in Amsterdam
'69 white 280 SL automatic