Unknown Makers Mark - is this JM on this sterling platter?

[goldassay]

All,

I am having trouble decoding / recognizing the makers mark on this piece. It is a heavy weight platter - weighs in at almost 12 troy ounces. So far from the marks I have identified sterling, london. The maker marks appear to be maybe a J and M - but I am very questionable about this J. Any thoughts on helping to identify it would be greatly appreciated. Thanks so much.
Charlie

http://beachgoldassay.com/wp-content/uploads/2014/11/IMG_18421.jpg
http://beachgoldassay.com/wp-content/uploads/2014/11/IMG_18431.jpg
http://beachgoldassay.com/wp-content/uploads/2014/11/IMG_18441.jpg
http://beachgoldassay.com/wp-content/uploads/2014/11/IMG_18451.jpg
http://beachgoldassay.com/wp-content/uploads/2014/11/IMG_18461.jpg

(admin photo edit - images too large - link only - see Posting Requirements )

[techsol]

Hi,

Possibly James Morison 1746.

Regards

Martin.

[goldassay]

Thank you! You led me in the right direction. See this list under James Morison:
http://www.silvermakersmarks.co.uk/Makers/London-IM-IR.html
Looks about spot on.
Thank you!
Charlie