Bruce, yours is Brazilian Rosewood. I was waiting to see if Ted Fry or anyone else had any experiences along those lines, but I never heard of any problems, other than getting good wood, today. I believe, the mfgr would change the wood, laminations or something to keep interest high. I believe your correct, they used Rosewood in the mid 1960's.
Today, importing some woods is taboo including the Brazilian Rosewood. However, Rosewood from Honduras is being used.
I have an unshot, Hunter in 60# with Bubinga, and they are different.
Their limb design was very consistent thru several models and over the years. It is a fast, stable design, and terrific looking bow and I would not hesitate to shoot one in good condition. I have been looking for one, myself.
After stringing, make sure the string is in the center of the limbs and there is no twist, or other visible problems. When strung lean the recurve against a wall and stand back 5 ft. and visually check the limbs and string alignment. Then hold one nock, with the other on the floor and sight down the strings, to see if the recurve is in alignment, and then hold it at the handle and sight down the back of one limb looking at the tip, then the other. If you not sure, get a recurve expert to look it over.
According to Brownell's website, B-50 string material, which is still available was first produced in 1944.
Your's is a beauty and if you have any concerns, call Joe (Whip), Rich Lopez, or Bowdoc.