Incredible find at an incredible price. Nice work cleaning it up.
The prices for oyster black pearl Ludwig drums from that era are all over the place. As someone said above, condition is a big factor.
Obviously, there is a single person who impacted the value of that color on that drum in particular. Someone would be willing to pay a lot of money to be able to add that to a close cousin of any of the configurations Ringo Starr used in that era. Being a drum from 1964, increases the interest. The same drum from 1958 or 1967 does not have quite the same impact.
That drum is essentially what he would have used, it's from the era in which he would have used it, and though the depth is probably not identical to the one he used extensively (his may be a one-off at 5-1/2" depth), it is nevertheless highly sought after.
If you want a very considered idea of its value, you might want to attempt to contact this guy.
https://www.ringosbeatlekits.com/
My guess is that the right person might be willing to pay you thousands for that drum. The $1000 suggested above is a threshold price at which to start. None of us would let it go for less.
On the other hand, younger drummers who did not experience the Beatles in their lifetime are far less likely to be interested in Ringo's drums and those of us that did live it are already fading quickly from the scene. Even though the Beatles and Ringo were a huge cultural phenomenon of mid-twentieth century music, their impact on the value of these drums will fade.
Therefore, if you want to see the peak price for the drum, I suggest you cash in fairly soon.