It appears to be a No.1 Lee Speed Sporting rifle in VERY nice condition.
Yours to do with as you wish, but realise that the value will take a big hit should you drill and tap for a scope.
There are zero aftermarket 'no gunsmith' scope mounts available for this receiver that I know of, past or present. A D&T side mount would be the way to go.
As I "don't do" Farcebook I cannot see the price - can you post it ? (please !)
Mine are not the best, but they are not too bad. I can think of lots of Enfields I'd rather have but instead of constantly striving for more, sometimes it's good to be satisfied with what one has...