A couple of photos would help if you can. Much appreciated.I also have a DU6 which does have the HT outlet very similar, so the mag could a DU The DA2 is a single cylinder and the production date seems to vary one drawing seems to be dated 1902 I haven't have any info on the DU My feeling is this is about as close as you will get without someone coming up with a magneto with the same markings. I understand the DA and DU series were used on early cars and motorbikes I could take Photos of both Magnetos
I think this has twin magnets too, just hidden behind that blasted hold-down strap. I guess Bosch used similar components on all their mags in any one year. So, given the length of time each type was made, the differences reflect the yearly changes rather than the model differences.I used to have a Bosch D2R magneto, which was identical to this, except that it had a double-row set of magnets, --not single. The D2R had the same cam-roller contact points as this as well.
Here are the two magnetos the one on the left is the DA2 and the other is the DU6 I have been hunting around the net and I think the mag in the photo is a DA1 the Renualt would most likely had the German magneto rather than American Bosch DU1 It would appear the DA magnetos were made in England as wellA couple of photos would help if you can. Much appreciated.