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Was able to find the Blanchard (Gardiner MA) practice of adding a smith's single intial stamp appears to have likely continued with the new shops (Pacoima/Calabassas) in California. If by chance this is an inverted mark, then Lewis Wise (c.1950-70) might be the actual maker. However, I have not yet been able to find any "M" name linked with P-B, apprentice or other, so no final conclusion is drawn yet.
Porter Blanchard made no flatware after 1955; it was made by his son-in-law Lewis Wise. Blanchard’s grandson, Troy Wise worked for the firm, is still alive and could answer your question if you can find him. He lives in Alaska. See:
Added for ref.: Technically, a "Dressing Spoon". A matching fork was made, causing these to often be called salad servers. (The narrow profile would seem to negate that use.)
By searching Allan Adler, SMP has more threads that include the other players from the Blanchard shops. (I'll see if this image can be restored later.)