Ww1 blue cross artillery gas round


I’m after any info this 7.7cm round. I have x4 normal glass bottles for this round and x1 shorter bottle of same diameter BUT don’t have any info on. I do know the germans used two other rounds the 10.5cm and the 15cm that used glass bottles. I have been told there only about 300 of these bottles left in the world. if any one can offer any info on these rounds that would be help full.

Email me at jgoeod@hotmail.com