Thanks Dave for the detail correction and mental nudge. The 301 blade as the first porotype slipped my mind. Let me get the OP a statement.
Bob, We are guessing you are trying for what you might call the complete series on the 302. As such the very first 302 made (single blade 301) will be the prototype/limited run with the 301 stamped blade, per Dave's description. I checked to be accurate this time, I have first offical (catalog) issue 302s marked with 2010 date code also. To be prefectly clear, the first catalog offer is a 302 tang stamped BUCK, 302 <-, USA. The 2010 stamp is represented here as best a keyboard allows, it is as shown in various charts in forum header.
So if you want one of the 70 or so, of the prototypes made you will have to be always on the search and be a little lucky. The first year issue will be easier to find. If you are member of the BCCI you can post your wants on the club website in the want ad section.... Good Hunting.
And Yes, lots of seller photos pulled from catalogs and the catalogs themselves show all types of models with no date code at all.
300Bucks