Very interesting guys! I also have never encountered the "plain" one at all, but I could have forgotten.

Have at least one NOS Brooks bag, same as the above ones, so no use to post pictures, I do have some pictures of my NOS Y straps, is any one is interested.

Cheers,

Lex

email (option): welbike@welbi**.net

The earlier pannier frames are different ,no support strips or wing nuts.
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Different construction indeed!

email (option): wd.register@gmail.com

Those would definitely have relied on the "Y" straps. Ron

email (option): ronpier@talk21.com

Last year I picked up what appeared to be 2 nos bags made by Acumen
I will check the dates on these as the stamps are very clear. But these have webbing strips at the back

Br
Jo’b

email (option): Jonnyob1atgooglemail.com