The BladeForums.com 2024 Traditional Knife is ready to order! See this thread for details:
https://www.bladeforums.com/threads/bladeforums-2024-traditional-knife.2003187/
Price is $300 ea (shipped within CONUS). If you live outside the US, I will contact you after your order for extra shipping charges.
Order here: https://www.bladeforums.com/help/2024-traditional/ - Order as many as you like, we have plenty.
Rick's first at was the 0550. The 0560 was basically the next step just like the 0562 and 0566 were next steps after the after the 0560.
The 0454 was the first knife from sidis. If you don't know the significance of the number, I can't help you. The 0450 and 0452 are evolutions of that design in line with the rest of their naming scheme.
Generally (there are a lot of older knives that defy this) 03xx = onion
04xx = sidis
05xx = hinderer
06xx = RJ Martin
07xx = ZT in house
08xx = Rexford
Again, tons of exceptions to this rule.
You are right because the 0400 isn't a sidis, 0888 is in house not rexford.
To help add to the list 0900's will be LG's, typically 0100 range are fixed blade type items. The triple digits like 0888, 0777, 0999 are in house flagships.
Also the zero on the front of the model number is there because "Zero" Tolerance.