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What letters are these on the webs of 1 & 2 cod rod codes?

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McCabe-Thiele (Ted):
I'm trying to read the codes for the big end shells as there are no big end shell colour codes  visible.

All four webs seem to have the same letter but can't decide if it's an A or a B it looks more like a B.
The conrods for 1,2 & 3 are marked [2] with number 4 conrod marked [3] all have the letter [F] on them.

What are the views here please?
Any advise as to shell colour code welcome.

If its a letter B I'm thinking they would have been 3 x Brown, 1 x Black.

..codes on crank web by Macabe Thiele, on Flickr

McCabe-Thiele (Ted):
The lettering is not visible on my phone but is on my PC - the clearest mark is on number 2 journal RHS web.

Oddjob:
Wash the crank with petrol or something that dissolves the oil film. As it dries you stand the best chance of seeing the codes then. Don’t forget it’s letter-number, so as the letters are on the crankcasing at the back it’s the number you need for the mains, that means you need the letter off the crank and the number off the rod to work out the bearing. The letters on the rods should all be the same as it’s the weight code so the crank is balanced.

McCabe-Thiele (Ted):
On the mains shells the colour codes are clearly visible on four of the bearings. I was worried that cleaning the crank with petrol might remove the black letter marks. I guess I've nothing to loose really. I did wonder if using all black shells might be a way forwards. DS has them in stock  for the big ends.

Bryanj:
If you fit all black you will need to run it in a while, instead of being ready to go straight away

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