I like your ASCII art graph, very hard work and deserves an applause, for I see quite clearly the synopsis of the time frames involved.

Entropy would indeed affect the watch, from the moment it left the watch maker's stobb, to the point in time it was sold to Loverboy. There would be an x factor of delayed entropy between the older and younger watch, so I can see where though they are the same watch, they are not exactly the same watch at all, cuz one is older therefore different than the other. STol rules, I believe, would apply then in this case. To add subsequent thought, no paradox would exist to implode existance, seeing that the exact same objects because of entropy, are not existing at the same time.

therefore other timelines will not be needed to be created to keep the balance of time spacial indifferentials. The sequence though seemingly random, is actually refined, organized and well ordered.

For take your excellent ASCII graph. Its kindof like a roller coster, essentially one continued line with a grand loop in the middle. The older watch in the vault of the antique dealer, went on a grand ride, no doubt, but on a continuous line, looping somewhere on its PLoT, for there is just one PLot for the watch. Maybe that is why the antique dealer she keeps it in her vault and does not sell it. Maybe she knows its secret? 0.o

So now the PLoT thickens. What if she was the one who was the pawnbroker way back when, and bought the elder watch, BUT, she had earlier accepted the younger watch from its previous owner, so now she has both watches in her possesion, and like all good pawnbrokers, examines her ware, cleans it up, to get ready for sale. Well now, she discovers that both watches have the same serial # and maker's mark. Roh Roh shaggy, what does she do? or even think? first off she may think its a forgery, but nah, the marks are consistant, and for what purpose would one forge a watch? So she gets to thinking that maybe the young gentleman who sold it to her could very well be a time traveller. Now I know a side story must be inserted, sooo hmmm, lets just say that in her youth she knew a young einstein, who was working at this patent office who used to talk of these things, and ever since then she keeps in touch through letters.

Soooo, she has this idea and therefore must keep the watch she just bought from Loverboy in safe keeping, and does so by always keeping it in the wall vault in her office. for later down the line, as she has collected gobbs of rarities, she eventually turns her pawnshoppe into an antique shoppe.

Now consider this, if you will. What if, she had taken out the elder watch to clean it up a bit, for to take photos of it, and she laid it down on the counter, and her nephew sold the elder watch instead of the younger watch to Loveboy?

I dont know yet, so I will have to think of what would be the result of this boo boo.