Thank You, Tania!
It was in good shape when I got it, but I did have to do some cleanup and polishing. The suction power is amazing, and also the fact that the original hose does not leak. Everything in the photo came with it except the crevice tool, demother, and sprayer, and I just happened to have them on hand.
Had a look at the ebay posting for your 775, looks like a nice machine. The hose looks original, and looks like the attachments are all there except the crevice tool and floor brush (I think the sprayer, demother, and polisher pad would have been optional for that model). And I think when it arrives you will be amazed at how powerful it is.
I'm thinking at this point that your 775 was probably from the early 60's, as it looks like a "little brother" to my 260. When it arrives, have a look at the data plate on the bottom. If it says Royal Appliance Mfg. Co., early 60's would be right, but if it says P.A. Geier Co., that would date it back to the 50's. As for size, I think it's about the same size as the pony tank, but the handle looks a bit long.
Jeff