I know what you mean, Grant. I must admit that I do get bored when pulling the same type target over and over and over, (unless they're silver). When something different shows up it's a pleasant surprise.
Especially a nice, large, old pocket watch! I've found a few of them now and they are a very nice surprise to be looking up from the hole.
I don't know if it applies to all of them, but the ones I found took a fairly rough scrubbing better than I thought. But, only if you can see the that the metal wont just crumble.
Nice find! Congrats!
HH!