The top Whitworth wrench is marked only in W for Whitworth while most T Williams' are marked in W and BSF. Also that wrench is marked British Made instead of Made In England. The other wrench is larger than any other Superslim I've seen - the 1-1/8W wrench opening is 1.88" or more than 1-3/4 wide. Is that correct, Danks? That's a big wrench.
I've often been tempted to try and collect a set of AF or Metric Superslims - but have resisted - so far.
Thanks for posting, great photos.
Al