It seems that my idea that Kobra lasted much longer than Vulcan in the UK might explain the numbering. Kobra out-lasted Vulcan though I’ve no definite info but have been told into the mid 50s-ish.
I checked emails from 2008 and found that I’d written:
“…Kobra outlasted Vulcan and so used up all the Vulcan material. For this reason other Fleetway material was used to extend the life of what was a popular comic in Germany”
I amaze myself at times.
Mystery partially solved!
An Addenda To The Addenda!!
Yes,I had the answer all along. I was going to add the Kobra covers from CBO to my Britcomics group[ http://groups.yahoo.com/group/britcomics/-see blogroll] where I have a lot of foreign edition covers in albums. I found a photo album titled Kobra so opened it and found I had all the Kobra covers plus the answers I needed!
Here we go.
Kobra volume 1  ran to 52 issues.
Kobra Volume 2  ran to 52 issues.
Kobra Volume 3 [1977/1978] ran to 53 issues
Note:that Tim Kelly No.30 cover is from vol.3!
Kobra Volume 4  ran to 16 issues
Kobra Pocket Book [1978?]
So the German version of Vulcan ran for 173 issues excluding the pocket book. Compared to 39 in the UK. All the covers are,as I say,in the Britcomics photo album section.
I feel like a blancmange without a cherry on top. My only excuse is that I have so much in my mind,on file and on my groups that I totally forgot the Kobra photo album.
So there you go. The definitive guide!