Hey! double post! But new question.
Value is what both you and the seller feel is a reasonable price. If he says 'make offer,' then open at $5.
The appropriate bb can be Record or Nuovo Record in 112 for 68 or 113 for 70. Spindles will say 68-SS-120 or 70-SS-120.
Does it have chainrings? Are they any good? They are hard to find. We old trackies would find them one at a time and treated them like gold, and we had 10 years of production after the road stuff stopped.
Later
Mel