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MG TD TF 1500 - what is this?

I had my disassembled 1952 TD soda blasted and found this "watermark" on the front splash pan (apron). Any idea what it reveals?
B Mooney

Left off picture

B Mooney

John Summers was the name of a British steel sheet manufacturer - based at Shotton if I remember correctly.
Dave H
Dave Hill

Every part of my TD had a number on the bare steel under the paint. The numbers were not sequential, but close. I thought they were an inspection mark. I did not find anything as detailed as this.
Bruce TD4139 Cunha

My guess would be that it is the batchlabel for the roll of steel as it was delivered to the body press.

Very cool to discover such a sign from the past and confirmation of the gentleness of soda blasting. Thanks for sharing it.
Willem van der Veer

EDD is probably the grade of steel and stand for Extra Deep Drawing

On this site edd is described, much too technical, but to support my theory.
cdn.intechopen.com/pdfs-wm/30903.pdf
Willem van der Veer

Found this on the front of the gas tank on the TF. PJ



Paul161

Jon Summers was a major steel supplier based just over the border in Wales about 15 miles from me. A lot of my friends and relatives worked there, so nice to think that parts of my car came from there.
Mind you it is a reflection on me that I live so close and speak no Welsh.
Ray TF 2884
Ray Lee

I found water marks on several panels as well but from a different supplier I posted them last year
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This thread was discussed between 14/11/2015 and 16/11/2015

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