This is an excellent shape and fully working Power Switch from a Hitachi SR-504.  
The Actual Switch Model:
Brand: SMK
Model:  E-41337
This Switch is used on many other Stereo Receivers in this time frame.

This is the Same Switch used in the SR-304, SR-504, SR-604.
I looked in the SR-304/SR-504 Service Manual and the SR-604 Service manual:
Both Service manuals state Switch 2638222 for USA Models.

The Leads were Cut as long as possible so you can solder it into the original Pins.

It might be the correct Power Switch for other Hitachi Receivers and Other Brands - please check your unit.  
The Mounting Bracket is Included which might be the correct bracket for other Receivers.

I have other Parts from a Hitachi SR-504, if you need something please Message me.
I combine Shipping.

Please review your Stereo Receiver to see if this Power Switch will work in your Receiver.

Please pay Soon after then Auction so I can plan my shipping