Picked this up for $150 today, little more than what I wanted to pay but I couldn't pass it up. Original signed crystal and crown, case is in good condition with no gold wearing off. Needs a new strap, runs nicely! Only thing bad is that I can't get it open, I see the notch where you insert a tool to pop it up but no matter how hard I try it won't budge so I will need to take it to my watchmaker. Would you guys guess 1970s without seeing the movement?