Taxi, I really don't believe there are any records of these transition 43 byf Pistols.
Variation 1, Early Frame, Early Slide show up in the G-Block
Transition 1, Early Frame, Late Slide, F-Block, but mainly G-Block
Transition 2, Late Frame, Early Slide, F-Block, but mainly G-Block
Variation 2, Late Frame, Late Slide, some in F & G Blocks, but mostly in the H-Block.
Each Block consists of 10,000 Pistols (really 9,999), but whose counting?
So a guess, and it's really a guess, is about 5,000 Transition 43 byf Pistols.
To a Mauser P.38 Collector it has added value. To most, it's just another 43 byf. I own one of each of the 43 byf variations and my two transition pistols are both in the G-Block