fwiw, the Festival is provided as 440/442 w/2 barrels (66/65)
the student B12 and B10 are also listed at dealers as being pitched at 442 with 65mm barrels.
Times change. 440 isn't divinely ordained, and many orchestras are tuning higher as time passes.
also, Holton's top french horns are pitched in 445!
There has been such a thing made about a 2Hz tuning.......I forget the list, but many American orchestras are now tuning to 442 (Boston Symphony, maybe? as I say, I forget the list) and in Europe to 444 (I believe Berlin Philharmonic, et al?)........so have all those players thrown out their vintage R-13's since they're in 440????
So if in fact you're aiming for a slot in something other than the community orchestra in Podunk, having a clarinet comfortable in 442 and being able to tune up or down 2Hz is better than being stuck in 440.
As Bootman said, he hasn't had any problems.
As for Fred's inquiry: yes, the sn is preceded by "F".