D.Sheppard - Your Bitzenburger is the one pictured on Bitzenburger's 1957 patent application. It would be the fourth generation, the first being 1940 (date of patent application, actual patent granted in 1943).
Your second tool is a Fleetwood that was made in several lengths 3" to 6", 3 and 4 fletch, straight, right and left, but not all combinations were made. An inexpensive tool that was sold during the 1950s and 1960s. Not sure of its earliest date.
DLM - Number and size of clamps varies on tools. After use, clamps could have been changed by owner to be any number or any type of clamp.