Looking for information on this Seamaster Chronograph, cal. 321

Hello everyone!
Since this is my first post in this forum, I'd like to briefly introduce myself. My interest in mechanical watches, particularly Omega ones, was somewhat accidentally sparked by some YouTube videos of watchmakers repairing vintage timepieces, which for some reasons were suggested to me by youtube's algorithm. Fascinated by these old mechanical movements, I soon acquired my first watches, primarily Seamaster models from the 60s and 70s. My first significant investment was a Speedmaster Mark II, followed by a Seamaster Chronostop, both in excellent condition.
Now, to my current issue. A local, very established auction platform is offering an old Seamaster Chronograph. The watch dates from 1961, has a diameter of 33 mm, with reference number 315.164 and caliber 321 (No. 17301032). Unfortunately, I've found very little information about this watch online, and haven't found a similar one with this dial. Most Seamaster Chronographs with the caliber 321 movement are slightly larger (35mm) and have "TACHYMETRE" printed at the top. This watch has "MILE BASE" instead.
Additionally, I find the "4" (in the number 40 in the left circle on the dial) somewhat unusual, as it's not in the typical font style compared to other Seamaster Chronographs from this era. This makes me somewhat doubtful about whether the dial might be a redial.
For these reasons, I'd appreciate your opinions - both regarding the watch/dial and its potential value. The current highest bid is 1100 EUR (plus a 30% fee). I'm pretty sure that will not be the final price, though. Larger models (35+mm) are typically offered for several thousand euros or dollars. However, I couldn't find any information about this specific model, so I'm unsure of its average value.
Don't get me wrong. I know a watch is ultimately worth whatever someone is willing to pay for it. However, I don't want to spend my whole Christmas bonus on this watch only to discover afterward that the watch is worth just a fraction of what I paid 😀 As mentioned, any advice or information as well as your thoughts about this watch would be very much appreciated.
Have a great weekend!

The Chrono is a ref. 2907. In my opinion it is a redial. According to the serial number the watch is from 1960/61. At this time the dials weren't marked 'T Swiss Made T' like this one is (there is no lume on the dial or on the hands) The first Seamaster Chrono reference showing T Swiss Made T is the 105.004.
Keep in mind that the hands of the subdials should also be alpha hands.
For me the value of this watch is the 321 movement. the pushers and the crown.
Last but not least I would advise you not to rely just on the name of a well established auction house. (and I know which auction house we are talking about)
Best Duffy

Hi Duffy,
Thank you for providing all the valuable information. I have to admit that I didn't even notice the "T" before and after the SWISS MADE text, and therefore I did not pay attention to the missing lume. I was more focused on the MILE BASE text at the top of the scale and tried to find a comparable watch. The fact that this watch should have alpha subdials instead of the straight ones is also somewhat striking.
As for the auction platform, it is offered by Dorotheum (here in Austria), which you might have already figured out. They have over 200 watches listed each month, and although the watches are inspected by their "experts," I understand that time and resources are limited, so one should not always rely on the provided information. That's also one of the reasons I'm trying to find more information here.
At the end of the day, I will have to decide whether to purchase this watch (accepting all the flaws) or save my money and try to find a better alternative in the future (though it might be more expensive). Oh well, life is full of difficult decisions, I guess...
Thanks again and kind regards!

I would like to add that one of the very few comparable watches I could find, was mentioned in this thread (and even there seem to be many differences between the two watches, such as the scale text, font, and subdial hands):

Help with this cal. 321 Seamaster with oblong 'O' Omega

The more I dig into it, the more I question whether this watch would be a reasonable purchase at all.

If you are troubled by the notion that buying a legit watch is going to be more expensive than buying a piece of garbage, you may want to rethink this whole process.

You're probably right. I think at this point I already made up my mind. I will pass on this one and get some nice Christmas gifts for my kids instead ;-) Thank you for your honest opinion.

I'm not troubled by it at all. Over the past couple of days, I've been intensely focused on this watch and have somehow formed an almost intangible mental connection to it (I hope you understand what I'm trying to convey). To be honest, I only started getting into "watch collecting" a couple of months ago, so my knowledge is quite limited (as is my budget), although I'm trying to absorb as much information as possible during my research. That's why I started this thread—to gather opinions from like-minded people with much more extensive experience than I have.

Hello! Thanks again to everyone for your input. Just wanted to close this topic by adding, that the watch has been sold for EUR 2.860,- yesterday (not to me 😜). I'll keep my eyes open. Maybe one day I'll find a better option that I can afford without having to sell one of my kidneys on the darknet.