Ulster had been owned by Imperial, but in 1963 a new Ulster USA was formed. The modern round log was used and blades are marked usually marked Ulster USA.
Ulster 4 blade, dark handle Ulster Stainless, 4 blade brown handle Ulster 4 blade white handle
Some of the handles are white
others are cream colored.
      Ulster Phillips
      screwdriver
 
Collecting modern Ulster USA knives
Four Blade official Boy Scout folding pocket knives by modern Ulster
1.     4 blade, dark brown almost black plastic handle, modern round Tenderfoot logo, 3 5/8" size, short screw driver, thin awl (like Camillus)
       With shackle.

2.     4 blade , brown plastic handle, Stainless steel, modern round Tenderfoot logo, 3 5/8" size, long screwdriver. Stamped Ulster
       Stainless USA. Was marketed as a scoutmasters knife.

3.    Similar to 1 except with a white handle and a shorter screwdriver.

                                         Five Blade official Boy Scout folding procket knives Early Ulster's

5.    5 blade, brown plastic handle, not stainless, modern round Tenderfoot logo, 5 5/8" size, short screwdriver, Phillips screwdriver. ????

6.    Identical to 5. 6A Cream handle, 6B white handle 6C Smooth white handle. Early 1980's 
Ulster Boy Scout folding pocket knife colors
     5A             5B             5C