[Mr Schmitt]

I am no Ju88 or Ju188 specialist, in my experiences with the Bf109 early models, I have found that removable access panels, even in some cases the very small circular screwed on type, the Werk Number of the aircraft was either via a data plate or painted on to the removable panel and also stamped into the panel. As you can imagine when these aircraft were needing repair, quick identification of parts was essential, after being stripped down. You can just imagine a handful of aircraft being patched up in a hanger and an aircraft mechanic has his parts on a bench at the back of a hanger and another guy takes over his shift and there are multiple jobs being done at the same time. Things can easily get confusing. So it makes logical sense. In addition, in some cases panels from one aircraft didn't always easily fit on another. Bearing in mind these were hand made and yes to drawings of course, but again being hand made, there can be very clear differences. Just recently I was comparing a part to a drawing and there was a clear mistake to its dimensions by 7mm would you believe, not a couple of mm. After all we are all human - I think :-)

So to add, looking at what you have on the data plate, in my opinion it is very likely the werk nr. Unless someone can show this to be the suffix drawing number of some kind?

Hope this helps a little.

Best Regards