Anyone recognize this call??

[SteelerFan]

Just out of curiosity (more so because it's driving me nuts!). I bought this pot call at least 20+? years ago in a small hunting store in south-central PA. I remember being impressed that it was a "two-sided" call, that allowed for access to the glass under slate. The pot is composite (a.k.a. plastic) and is signed - but I can't make out the last name? It's a "Sam...Clerson? Derson? Delson?" 

It actually has a really good sound to it, however the chamber was put together? That small glass surface can purr and cluck with the best of them. I was just curious about the call maker / origin, if anyone else might recognize it or the signature. Thanks for looking.

[letinmfly]

http://sandersoncalls.blogspot.com/

[SteelerFan]

AWESOME!!! THANK YOU! (Sanderson.... Duh huh )

Sam derson makes a call just like it! Geez, I'm an idiot.

OG (courtesy of letinmfly) solved this mystery in under 10 minutes! (I'm not gonna say how long I tried...lol)