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Factory d&t for modern standard scope bases started around 1950 for the 99R, 1956 for the 99F, and 1956 for the 99EG. Everything after that was factory d&t for scopes.

Prior to this, any modern d&t for scope bases would be after market. I've got more than a few, the majority are very well done and work fine. Just not "correct".

There were also a lot of non-standard d&t jobs for odd things, ranging from holes for side mounted scope bases like the Echo or Weaver T7, to differently spaced top holes.

If an earlier rifle is d&t, it's best if the bases come with it. Otherwise ask for pictures to check to make sure it's standard, a lot of the non-standard bases are a serious pain in the neck to find.

1930's 99T that was aftermarket d&t:





There are also the Stith mounts, which allow certain scopes to be mounted without the drilling of extra holes. Rear base is secured in the tang sight screw holes, front base is secured in the rear sight dovetail. Works for any 1899 or 99 made after WWI up to 1959 (on earlier rifles the rear sight dovetail is too far forward to work well). Comes in 3/4", 7/8", and 1" versions. Here's a 7/8" version with a Lyman Alaskan 2.5x with post reticle on a 1941 99EG in 250-3000: