Here on this forum plane types is a sacred cow and I don't think it is and have said so. And it it is okay to make an old plane useful again even it the front knob is not correct.
To me, plane types are not a sacred cow, but knowledge has value.
My planes are all users with the bench planes being from type 4 through type 17. It is easy to understand why some might like the challenge of assembling a set of a single type whether it be type 11 or type 18. (The later type was a short production with the depth adjuster having skewed knurling. These often catch my eye from across the room. They are usually inspected and enjoyed, but one has never come home with me.)
For me knowing about the different types has paid off when rust hunting. Often when looking at planes while showing the shop owner/keeper a few things about their wares has been rewarded with a price reduction.
It also engages them in conversation to get a feel for what kind of deal might be possible.
BTW, my personal preference is for type 13 or earlier. These will all accept a low or high knob. It is also a type or two before the ogee frog.
jtk
Last edited by Jim Koepke; 05-20-2021 at 10:15 AM.
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)