i'd buy it. i don't know if i would go as high as the bids are up to but i would have considered getting in lower.
it looks to be really clean and if the action is anywhere near as robust as a centerfire Mauser rifle you just can't go wrong. the 200 meter sight seems a little (lot) conservative though.
after a little research it appears that this model rifle was introduced in 1924 as the fourth in a line designed by Mauser designer Fidel Feederle, and the first of that line to have an external safety. the line of rifles (including the Eb300, En310 and El320) were introduced as sporting rifles to not conflict with the Treaty of Versailles. by 1934 the rifles had transitioned to a more familiar Mauser 98 style action.
here's a link that shows the rifle with an apparently optional scope system.....Mauser Es 340 N
all in all it looks to be a pretty decent rifle and even after the research i would still buy one, maybe even more so. then again, i have a soft spot for Mausers and have been working towards owning a military rifle from every country they were made in/for over the years.