The Manhattan name was Kaiser's from 52 onwards, 51 and before its Frazer. Its possible that the year is mistaken, such as the "title" (such an odd concept--glad we don't have that in Canada) being issued in 1950 for a 1951 model car--no, that won't work, because in 51 Kaisers were still Special (aren't they all?) or Deluxe or later Virginian for 52 as opposed to 'real' 52 Kaisers. BUT, if it has Frazer Manhattan script on it, I think that is worth a few dollars for Frazer owners depending on the year of the script. The serial number on the driver's door should sort out what it really is