Unusual cartridge

[Bomber2007]

Dear collectors,


I bought this very unusual cartridge case at a flea market. It is from a 20 mm gun, but the strange thing is that there are no markings at all on the base of the case.


Could anyone tell me more about it, and possibly provide a date? The case looks quite old and has a blue and red circle on the base.


I’m looking forward to hearing your thoughts

 

[Rrickoshae]

20mm Vulcan M61 cannon case (a modern Gatling gun type weapon). They save sooo much money by not marking them in any way

 

[Bomber2007]

thanks