I agree with John (and Chris has a good point about coolness
) and I wanted to add something.Pins were not slotted back then. With the advent of pl*stics some fool.... said hey let's slot the bridge pins and this will eliminate the need for an operation when building the guitar that slots the bridge, top and bridge plate. As builders you know that this operation requires a bit of skill and is not exactly a mass production task.
So with the advent of cheap, mass produced slotted pl*stic bridge pins guitars also began being built differently without the bridges, tops and bridge plates slotted and that slightly higher paid worker who may have done this prior was SOL and had to go to work at Wendys instead....
Now along came the passage of time and a relatively new malady for acoustic guitars bridge plate damage from slotted pins permitting the string balls over time and with the addition of string tension and wear to wear their way up through the bridge plate and even the top damaging the instrument. Slotted pins permit the string balls to rest on the edge of the holes in the bridge plate and not firmly on the flat of the plate.
We've never seen an example of this plate damage happening to a guitar old enough to not have used slotted pins unless they were added later. It's very common to see damaged bridge plates these days and cheap, slotted pins are usually why.
So with all of this said.... pins had a slightly different job description back in the day and one of their assigned tasks was to be sure to push the string balls over to be firmly in touch with the bridge plate and not just the edge of the bridge plate as is the case with slotted pins.
I would not be keen to duplicate the angle either in it serves no purpose. I would be sure however to follow tradition and historical accuracy and use unslotted pins and instead slot the bridge, top and plate.
This goes for builders of contemporary guitars as well your "serviceability quotient" as I call it goes way up when you protect your clients investment by using unslotted pins. We can get into the weeds too about 5 degree vs. 3 degree as well but simply using unslotted is a huge improvement.
Lastly much of what we've seen in the evolution of how a guitar is constructed was the result of the need to mass produce and keep costs down. Companies also often built with what they had laying around, Gibson is an excellent example of this with lots of guitars produced by Gibson that can't exactly be called this or that in terms of which model and there was a thing called employee guitars too which is self explanatory.
