One for the Longines experts . . . is this a 902 mvt.?

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What is says on the tin, and if not, what is it?
Looks like a Landeron to me, perhaps a Landeron 48 or one of its derivatives
 
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Looks like a Landeron to me, perhaps a Landeron 48 or one of its derivatives
Many thanks--latest info. is that it's a Landeron 51.