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Does the serial # plate behind the passenger seat have black paint on it like the dash data plates or is it metal with #s stamped in it? What is the best way to clean it without ruining it?

It's etched and there were both black and white backgrounds over the years. Brake fluid DOT 3 will lift heavy coats of overspray right off.


Black

These plates I assume were installed at the factory. Would they have arrived at the unit painted over with OD paint or not painted over?

bbloom wrote:These plates I assume were installed at the factory. Would they have arrived at the unit painted over with OD paint or not painted over?

There are photos in Ryan M's M-38 reference guide showing the
WO paint line. Tubs are seen hanging on a chain drive conveyor
running thru the processes meaning they were painted before assy.
Surely the plates were added later in assy (after paint). My 2c.

Bill & Rick your assumptions are correct.