For you tube call collectors......

[Tarheel]

You don't see many Perfection tube calls, and the ones you do see normally don't have the Perfection sticker.  The slanted mouthpiece facilitated using Perfection diaphragm mouth calls with multiple reeds.  The theory had merit...

[mspaci]

Have never seen one, Thanks for this, Mike

[Yoder409]

I had one of these at one point.   I think Jim gave it to me.

No idea where it may be now.

[RaspyD]

I still carry one of those and use it quite often.

[TScottW99]

I haven't seen one of this in a spell. I have a couple box calls and glass calls, was just running a Perfection box yesterday.