Can anyone shed any light on whether any original Mauser sporters were supplied with Lyman peep sights from the factory?

Speed's book mentions that the Lyman 35 and 48 sights were "available" but does not explicitly state whether any were installed at the factory. My guess is that they were installed by retailers or as aftermarket additions only. He also mentions that the "British used" Parker Hale peep sights, but surely these must have also been installed by the retailer or final customer.

I have a very early Type B (1909) in 7x57 which has a Lyman 35. It looks so right that it seems original to the gun, but I suspect not.

Unfortunately I don't have Nick Stroebel's book handy so I don't even know the introduction date of Lyman sights for Mausers.

many thanks for any information