Vidar precision resistors?

[Stray Electron]

  I picked an old circuit board recently that has a large number of 0.1% tolerance resistors made by Dale (MFF series), some marked BA-6 (yellow bodies with black markings) and others made by Vidar" (black bodies with white markings).  Dale I recognize and they've been bought out by Vishay but I can't find anything about their MFF series and I can't find anything about who BA-6 is or anything about Vidar.  Is anyone familiar with these companies and their products?  My guess is that this dates from the 1970s.

   I don't know how old this board is and there are no ICs on it.  The transistors (mostly 2N3053s) on have the number 435 on them which might be a date code but they're all made by RCA and I can't find a RCA data sheet that explains their transistor markings.

[Vgkid]

Take some pics.