Vintage T-Shirt Forum & Community Authentication Appraisals

Hi everyone...I came across this shirt from a batch of early 70's shirts and can not figure out the band or group from the image. Do you recognize? It's printed on a towncraft/JCPenny branded shirt with a front pocket. I also found a '74 Deep Purple on the same brand. This show/concert would have happened somewhere in the NW Seattle/Portland area. Thanks for your help.

We posted this on Instagram too:

http://instagram.com/p/xK1f7CgRHQ/?modal=true

I figured it out after some more investigation. The shirt is a Ravi Shankar & George Harrison T from a show on 4 Nov. 1974. Does anyone have any idea what this may be worth. Condition is very good.