Try this one, Collectors.

 Go to Advanced Knife Search after logging in.  Then…

The Custom Work Page appears, then…

The different styles of long tail C serial numbers appear.  But I am only showing the first two…

Notice that the first picture has an R in a circle.  This indicates that the long tail C serial number is a registered trademark.    I have documented 944 knives with this mark at this time.    The second long tail C does not have the registered mark, and I have only found 17 of those to document at this time.

Here’s the skinny on this.  When the long tail C was first used on knives, the factory said that knives with a long tail C were official Case Collectables.  I take this to mean that they were the total creations of the factory.  I have only documented knives without the R in the years 1986 and 1987.     By 1988 the R is in place on the knives I have seen.   So, maybe at the start the factory applied for a trademark, and it took two years to get it.  Or, they applied after they had been using it for a while.  I have only seen 17 knife variations without the R and they are all in knives dated 86 and 87.  These knives are a unique  kind of transition, and I believe they are quite collectable.   You can follow the trail I laid out, and see the 17 variations so far.  If you have  any different ones, please send me some pictures, so I can add them for future collectors.  

The details of more than 130 years of factory production can be elusive, but I try to get as much right as possible.  As my friend Tommy Rex Schnable says  The BladeMaster has got KnifeDB almost three quarters of the way to nearly perfect.