Why MM has so many different stamps?

[gamxiaoyuan]

This is a question that already brothers me for a while. Some stamps on the bottom of MM corn pipes are just black ink, some are yellow stickers and some are brown and white? Anyone knows why? Thanks :wink:

 

[briarfanatic]

Black Ink printed on the bottom indicates a wood plug to help protect against burnout. The stickers are on models without the hardwood plug.

 

[gamxiaoyuan]

@briarfanatic

Thanks buddy. I like your cat pic. :D