Good start on BV. Could we say that all other USA makers, those not covered above, would be close enough in BV to label them BV5?

OK, now, can you attach any value factor to the BV1-4 levels, BV5 being 1?

The next question will be: Is there a common level or Original Quality grade across the BV1-5 envelope? For example, for OQ only, does a Trojan = Stirlingworth = plain M-21 = Field L.C./Lefever = Field Ithaca = ? Stevens = ?