So how did Phil's No. 1 end up with BP 4 Iron "British Best" tubes?

The Winter 2020 Journal of the LCSCA had an article regarding a 1901 F (lowest) grade hammer gun also with 4 Iron "British Best" tubes but AFAIK no BP

[Linked Image from photos.smugmug.com]

Phil once had another 1901 F grade with not very well matched 4 Iron

[Linked Image from photos.smugmug.com]

Maybe the high grade barrels were special ordered for a lower grade gun?
I am of the opinion that Hunter Arms may have just been using up "old" British sourced rough forged tubes, but why use 4 Iron? It is very difficult to discern the pattern of rough forged tubes, which were paired and wired together for shipping in barrels of 50. Maybe the tubes were in the bottom of a bin later filled with Belgian 2 Iron tubes? Maybe it was Monday after St. Patrick's Day? wink

PLEASE CHECK YOUR PATTERN WELDED BARRELS AND POST IF YOU FIND PROVISIONAL BIRMINGHAM PROOF

Thought as to 'WJ' would be most appreciated also.