Look on the front of the O&R, it will say 60 or 29 or 23 or 19. The .60 is good for about $100. The smaller ones maybe $75. These are common engines, and it's not mint in the box and complete. I had a nicer example of each up on ebay some months back, they went for $75 and $100. They went for more a few years ago, but prices have settled down.
If you want to ebay it, wait a few months, it's pretty dead in the summer. But get the $200 price tag out of your mind, it's pretty doubtful nowadays. Happens, but not often. As far as getting more for it HERE on the new auction site, you kind of have to laugh...