Closest spray paint to 69 F8 Dark green

Here is one place I am familiar with. Touch Up Paint and repair | AutomotiveTouchup Their paint was an exact match the few times I used them. Granted it was for newer cars and I bought it in quart cans, but I was highly impressed with the quality and match. I went to their website and they did not have F8 green listed. However, they did say to call them at 1-888-710-5192 if you did not see what you wanted.
Here is the problem. If you went to 5 different places and had a quart of urethane F8 basecoat mixed, they would most likely be a bit different from each other due to variations in different brand's tinting bases. They would still be a beautiful F8 dark metallic green, but all a bit different from each other. The odds of you finding a spray can touch up that would match well enough to use for touch up is pretty slim. I wish you good luck.