This Machin "post and go" mailing label bears the logo and name of The Postal Museum in London. The only other such stamp I've seen identifies "Wheatstone House". It is discussed on another SCF thread.
For those who haven't heard, Douglas Myall, the world's foremost Machin expert, passed away on January 30, 2019 at the age of 96. He was the man behind The Complete Deegam Machin Handbook, the most complete reference book about this series. The third edition in 2003 contained 1,272 pages in two binders. Rest In Peace philatelic brother.
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