Auction link: https://www.ebay.de/itm/385025768282 (https://www.ebay.de/itm/385025768282)
I've never seen a German item go that high...
This type of receiver apparently was used on the earliest German LB phone, the Model (18)81. All later models used receivers with a sideways handle or handsets. It does not even have a common name in German, so that the seller used the English term.
Yeah, I'd say that's a little more then pocket change.
Supply (might be the only one in existence or available) and demand (at least 2 wanting it) at work.
The same item is at auction again:
https://www.ebay.de/itm/385072401000 (https://www.ebay.de/itm/385072401000)
Apparently something went wrong, or?
Last time bidding started at €1, this relist has a start price of €2500.
Additional listing photos attached.