I,m the lucky owner of a Conn 6D from the Elkhart-plant and
according to the list of serialnumbers it's dated about
1935 / 1936. Everything is right for me with this fantastic horn !!! Needless to say I,m very careful with it.

Now my question; what is the best way of storing and
transporting ? A gigbag ( leather ) or a hard shell horncase ?
I have a case from Gator which is sturdy and the horn wil
fit in it but closed there is a little free space that allows a little movement. I just don't know if that's
gonna hurt the instrumet eventually !?

Thanks in advance for any hint !!

A hardshell case is better than any gig bag. The softer you go the more opportunity of damage. If there is movement inside the case you will also eventualy get damage. You either need to do something to keep it from moving; like install some foam wedges or get a case it does not move around in.

I am very happy with my Paxman case. It is smaller and lighter than the Gators or ProTec's and I think is better than many hard hard cases. If you live in Europe get one. If you live in the United States then get a Thompson Edition fixed bell horn case. (I think they are made by the same people who make the Paxman cases).

Thanks for your quick reply ! I start with trying to get things right with foam
and hope that will be sufficient. I'll suppose I need a lot of it cause the gap
when the Gator is closed is about an inch berween shell and horn !

I'm from Europe ( Netherlands ) and for sure I'm goïng to follow you're advise
( in the near future ) to look after a Paxman-case !

You don't need to pack the whole case with foam, and in fact that would be a bad idea.
Get a good quality foam from like a camera store, and get some good adhesive, like 606 fabric adhesive (you can get that from a sewing or quilt store). You just need to support the horn right there at the valve cluster. A foam block about 8 inches long (20 centimeters),and four inches wide (10 centimeters) should be good, the depth will depend on how much space there really is.