Fake snail drum? HELP
 

I have a snail drum that i found in my grandfathers closet. I think it might be fake because it has no serial numbers on it. How can i tell if its real? The only markings i can see are on top of the drum. The markings are "'68" over a weird three line symbol with 1015 below it. Also a crown with MGC below it is also marked. Can anyone help me identify this and figure out what its for or if its real?

Please email me at xfactor1@ku.edu if you have any info on this item. I dont check my inbox here.

Hi, there is no need to post the same question twice :)