I have an oval handle too. Found whilst dreaming about a wood handled Baby Coes.
(I never got a Baby, btw)
I don't think the oval ones are very scarce at all. I got mine for just a few dollars.
That little round handle one though? It has to be considerably rarer than the Baby. I never even knew it existed before now.
It was right around the time I was looking for a Baby, that I decided to start rounding up 6" monkey wrenches. I kept seeing them going for next-to-nothing. It was so good for a while there, I wouldn't even buy them unless I could get several at a time to save postage. I could afford to be picky about condition, everything!
Everybody wants a Baby and now this early round handle I'm sure, but nobody really cares about 6".
Nobody else but Coes even made a Baby, but everyone in the wrench business made 6" wrenches, and you can have them almost for free! This is my idea of fun.
Going after what everybody and their dog already wants? Is just an exercise in frustration and expense hardly anyone can afford.
Going after what nobody wants, yet?? (Be there first or don't bother).
This is fun.
yours Scott