I have a Speed Graphic with an RB back (not a Graphic spring, not a Graflok) and this ended up not working. I can't say for sure it is Graflok because I don't have one of those around to test it on, but it looks pretty darn similar to the normal film holders I've seen around. Does 6x6 with the included mask as well as 6x9. Everything looks to be in fully functional/light tight condition but it has not been film tested by myself. Includes dark slide in good condition.
Let me know if you want me to make any measurements.
Item will be wrapped in bubble wrap and boxed. Ships via USPS to anywhere in world. Overseas is expensive now but if you pay for it, I'll ship it.
I have 100% positive feedback on eBay and have done a whole bunch of transactions here on APUG both buying and selling.
Price: $50 plus actual shipping cost ($8-12 most likely), or if you are local, feel free to pick it up.