Unidentified Swedish mark

[Peartree]

Hi I was hoping someone could help identify the top left hand assay mark of the M with crown in an oval? All the other marks are clear to me - this is from a small swedish quaich type bowl made in 1954 by MGAB, from Upsala. 800 standard. But what is the M mark!!? Thank you. Anthony

[Peartree]

I will answer my own question - please comment. I think the crowned M is the “logo” of MGAB and probably indicates they had a Royal Warrant (or Swedish equivalent). The M in GMAB is very similar typeface to the Crowned M, and reminds me of the (Danish) Anton Michelsen logo when they gained their royal warrant.

[Qrt.S]

MGAB is the maker's mark for K. G. Markströms Guldsmeds AB in Uppsala (U). The fineness is not 800 but 830/1000. The crowned M is Markströms logo.

[Peartree]

Thank you