I'm not being "sooooources" but have you seen evidence of that 1895 date? and it being the earliest use.

I found a 1905 typewriter - mignon 2 with it clear in the bottom left

https://www.pinterest.co.uk/pin/398779741990956297/

while the mignon 1 doesn't

https://www.pinterest.co.uk/pin/my-future-vintage-collection--29132728832926664/

this Hamilton Automatic typewriter - 1887, doesn't

https://www.pinterest.co.uk/pin/3729612173464079/

it appears on the 1901 US-TTY Baudot–Murray code for telegraphs but not in the original 1888 US patented Baudot Code

I've just spend half an hour chasing the actual evidence but it's bald assertions such as yours.

Britannia doesn't offer any

https://www.britannica.com/topic/number-sign

other just say 16th century but don't offer how they know that

https://www.sporcle.com/blog/2017/08/octothorpe-history/

one would think it was in a set of linotypes for printing if it was