Thanks for the reply. I suspect it's a real one. For one thing it's probably too old! I doubt there were many knock-offs readily available in the US before eBay and international internet sales became the norm...

It’s had a bath and is currently hanging to dry. I ordered a new bottom board for it which arrives Tuesday. I'm going to use my new style (adjustable compartments) digital insert and a two compartment insert once I put it into service. This will fill in very nice for times when I need to carry all or most my stuff. I can stuff one of the F2s full and carry what I need, but in my opinion they aren’t as nice to carry when they are that stuffed. More importantly, there’s no room for snacks when they’re that full of gear!!!