I received stock of Swiftech MCP 655-B Two weeks ago and on the back they have stamped (lightly) D4 Basic ... From what I remember though the D4 only came in blue and did not have an RPM wire.. So if yours is Black and has an RPM wire you have an MCP 655-B which is the same as a D5 Basic.
I am making an assumption that Laing had a bunch of D4 housings left and used them, I would also make the assumption that any store that recently purchased MCP 655-B will have D4 Basic stamped on the back.
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