A v3 camera with Serial number 1870 was sold on Ebay on March 24 2016 for 402 Euro (price added in table). This is the description

"In moderate cosmetically condition with few signs of use
and storage.
The shutter runs on all speeds, the speeds seem to be
all the same. On B the shutter closes again instantly.
The shutter curtains are slightly creased but have no holes.
The lenses have no scratches but haze and fungus.
Setting the focus and the aperture is smooth.
The finder can be opened and closes without fault, it is
dusty and hazy inside."

A Version 3 apparently without SN was sold on May 10 2016 on Ebay for 766 US$ (price added above). Here are some pictures. The camera is probably a very early Model 3 (red B, relatively thick gravure of Praktiflex, no additional screw below rewind lever - which can be found on the later Model 3 cameras).

Ebay Description:
"ORIGINAL VINTAGE PRAKTIFLEX German Camera with leather case & Ludwig Dresden 1:3.5 lens. I am by no means an expert of cameras, but was able to determine the following. This is an ORIGINAL Praxtiflex German made 35mm SLR camera. I believe this is a first generation / 3rd model edition - putting it's manufacture between 1939 and 1940. It seems to be in very good working condition. Has a Ludwig Dresden 508510. Victor 1:3.5 lens - NO strap lugs / removable back cover / tripod socket / leatherette covered body with "script" style lettering. There is some light pantena in areas - come with leather case with strap that has "DR" engraved on the top of case. The case itself also has some patina - more on the brass rivets than anywhere else. "

A version 3 camera with the serial number 1008 was sold on Ebay on August 20 2016 for 899 Euro (slightly over 1,000 US$) (price is logged above in the table) - this could well be the earliest surviving Praktiflex ! If you are fast enough you can maybe still find it on Ebay - the object number is 282134271067