This is a 215 fan from my 69 340 4-speed with factory air. 69 340s with no air had the same 215 fan. But only 340s with air did have this thermal fan clutch part 2863263 (except clutch 2863266 if 2.76 axle). Non air 340s had a different non-thermal fan clutch. The only marking I found anywhere on the fan assembly is this 46237 emboss on the hub.

This fan clutch is a parts counter replacement date coded 7/30/73 (G30=7/30, year=DB?) but otherwise identical to a 69 factory Eaton part, according to Pampered Corvettes, who recently restored it with a date code preceding my SPD 11/8/68.