After that listing expired, the knife was relisted with a starting bid of $500, which is the auction currently running now.
I happen to have a W.R. Case & Sons 8387, and a Case Tested 5387. The sellers knife appears, at least from the pictures, to be different from my knives. The difference appears to be mainly in the shape of the master and the pen secondary. The stamps are also different. Here’s the seller’s knife. Here are my knives, both of which I believe to be correct. (My 8387 has a broken tip on the file blade.) And here for comparison are some cuts from Sargent’s 7th Edition. Here’s a link to the only other Case 8387 I found here on AAPK, aside from mine. viewtopic.php?f=17&t=43858&p=438908&hilit=8387#p438912
I’m not saying the seller’s knife isn’t correct, but in the pictures it sure looks to be different than mine. Camera angle might account for the difference in appearance of blades, but the spear and pen blades on the seller’s knife appear to have fatter bellies, the swages and choils appear to be cut differently, and the stamps are different.

Sorry for the lengthy post but these represent all the research I’ve done trying to figure out the seller’s knife. Now for the $64 question - what are your opinions (learned and otherwise)?
Ken