BV1 = Boss, H&H, Purdy, and Woodward
BV2 = Wesley Richards, Grant, Rigby, Dickson, Beesley, Powell, Atkin, Churchill, Henry, Lancaster, Evans, Watson, Wilkes, Greener, Boswell, Gibbs, Lang
BV3 = All other Brit brands and well known Continental makers associated with high OQ
BV4 = Lessor known Continental makers and/or associated with lower quality
BV5 = Little known Continental makers and/or associated with poor quality
Remember, it is unwise to try to associate Original Quality grade of an individual gun with the makers name. OQ stands alone. The issue with building high quality guns was not ability to build them, rather the ability to attract orders for them. Shops were run by masters and they knew how and/or who to hire. The Brit trade always knew how to earn the money for an order.
DDA
