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2V valve cover manufacture dates

sproggy

Just got it firing!
Joined
Aug 5, 2013
Messages
2
Location
Welwyn Garden City
While I had the valve covers off my B11 for a service, and with extra time on my hands due to lockdown, I decided to strip the bubbling brown paint off them and polish them instead. The first one I did came out really well so then I did the second one, which didn't turn out so well. Clearly they are made of different alloy.

There are cast numbers inside the covers which I suspect relate to date of manufacture but does anyone know how to decode them?

One cover has a cast '04' followed by an ink printed '8'. This is the one that polished up well. One of the twelve segments surrounding the 04 is marked.

The other cover has a cast '07' with two segments marked followed by a cast '06' with eleven segments marked.

The bike is an '06 model (from a sales/registration point of view) but manufactured in '05 according to the frame number.

Any information on these numbers/dates would be appreciated as I'd like to get hold of another cover of the composition that polishes well - do I need an early one or a late one? I'm assuming that at some point in its life the bike has had a valve cover replaced, either intentionally due to damage or due to mixing up parts with another bike during a service.
 
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