Aloha Bart!
Specifically: first of all I would rate your Speedy overall rather a bit farther away from good and closer to what Collectors grade could mean, on top of that it's way over average attractive. I wouldn't bother to go close to 9 if it was on offer, Today. A quite close "Tomorrow" would proof me right to pay that price. I recently aquired a perfect, breathtaking, outstanding 145.012 for just a bit above 10k $ without hesitating a single minute. Because it was worth it. Period.
General: The discrepancy between 105. and 145. in the - let me rephrase it a bit to "(outstanding&)collectible" category - is only around 2k $ which is quite close considering the total price.
I am quite sure that this gap will get wider in the future ( availability of fine pieces, production numbers, "historical" bonus for the 105.012 etc.) but likeweise the gap between 144.022s and 145.012s, for all the reasons mentioned in above posts. The current "undervaluation" comes probably from very steep 145.022 prices I observed which obscures the picture a bit. But that will settle, at least in terms of value difference between a 145.012 and the .022s.
Meanwhile, enjoy your cheap crappy watch and..keep it
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