I doubt it's a Weber cam, but would really need to see a picture of the snout.
From the old Weber cams I've seen over the years, they would stamp the snout with one of two stampings; one was a Weber written out in a pretty cool script and the other was a block letter WEBER. The grind number was then stamped underneath.
Anything is possible, but try to post some pictures if you can.
Here is what I found. This is for a Weber F5S:
-Weber F5 S cam, duration: intake.265,exhaust.260, Lift: intake .340 exhaust.342.