When I got my 1969 American Eagle from Oregon to Germany, it was the first time I saw a seal between the cover and the ignition housing.
This seal has definitely been manufactured industrially and is precisely matched to the shape and holes.
That was the only time I've seen such a seal on a Laverda 750. In the original spare-part lists there is not such a gasket listed.
With a little grease on the screws for sealing, the seal works perfectly.
E.g. the 421 km return trip from the Austrian Laverda meeting in heavy rain last year was done by the Eagle without any problems.
Thomas aus LAU