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Sorry - the photos that I posted on the wiki are the only ones I took and I cant see anything useful up under the dash. You can see a number printed on the side but it doesn't seem to relate to a year. The information I had from BB was that Volvo changed their minds a couple of times on this switch for the 1800. Maybe it was related to parts availability or there were different configurations for different markets. It is pretty easy to spot the switches that had the twist-to-wash feature from the graphic on the knob. Perhaps a parts catalog for the 1800 might tell which chassis numbers had which switch. I only have Amazon catalogs so I can't confirm this.
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