You may be OK with custom aftermarket work today but you may want to consider the consequences. Some may not matter to you today but could later.
For example, Rolex will not work on it at their Service Center unless you pay to replace the custom items. Costly.
Be aware that you are choosing a vintage watch at least 40 years old. The case should have a serial number that the seller did not disclose, nor picture to determine if it’s 40 or 50 years old. The case lugs have been polished significantly as the ones on the crown side seem to have springbar pins proud of the lug holes (poking out shows that significant work has been done).
The watch likely has an aftermarket crystal (because the seller takes pain to note the word Rolex on other parts but is silent on that part). It may function differently in terms of watertightness. Seller doesn’t seem to guarantee this point but could matter later. The watch may fail a pressure test.
You are looking at a non-quickset movement. Tedious changing the date at the end of any month with less than 31 days. It may not be the one this watch came with - that isn’t pictured so you have no idea of it’s condition. Also the inner caseback or midcase could be pitted (further compromising water tightness)
The datewheel may have been swapped for an aftermarket one. Lord only knows how many non-Rolex parts are in the movement.
(like barrel, mainspring, hairspring, crown/stem and other items replaced on old movements with aftermarket part’s due to watchmaker not having access to genuine ones)
All I can say is the allure of low price fades quickly in the face of future problems that could be costly.
I could go on but I hope you see there is no shortcut - sharing this in the spirit of communication and hopefully avoiding future remorse.
Maybe consider a newer DJ with stick hour markers, or if Vintage is your goal, then reach out to the trusted dealers here.
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