I have done the same, drop outs never had that hole in them and it’s got bottle cage mounts.
I assume they just took a road frame and put track dropouts and forks on it.
They look like Shimano track ends to me, just sayin'. I have identical looking track ends on my Rourke that I have known as Shimano for the last 6 or 7 years, but of course I could be completely wrong.
I have done the same, drop outs never had that hole in them and it’s got bottle cage mounts.
I assume they just took a road frame and put track dropouts and forks on it.