Silver Case makers Identification

[Rockmoc]

Can anyone please help me ID the maker in the photo below.  Its from a pocket watch case with a Lion, Anchor and M as hallmarks (see photos).  I have scoured the internet and can't find anything.

Thank you in advance.

Rockmoc

[Tmuir]

Its Birmingham assay office the anchor, Sterling silver, unsure of the year though.

It could be 1911-1912, or 1810-1811, if you could show the whole watch we could quickly work out which year.

The maker's mark is unfortunately not in the 'bible' of British silverware 'Jackson's Silver and Gold Makers', but it not uncommon for watch case makers to not be in the book

[Tmuir]

http://www.silvercollection.it/englishsilvermarksXL2.html

 

Scroll down the above link to LH

in 1910 their was a LH, maybe he formed a partnership with someone else and became LHD & Co in 1911

L.H into an oval Leopold Heinzelmann, 60 Atlantic road London SW Birmingham 1910 hallmark